Ce memoire presente une large etude sur la spectroscopie du radical libre bai. La partie experime... more Ce memoire presente une large etude sur la spectroscopie du radical libre bai. La partie experimentale a ete developpee au laboratoire aime cotton a orsay. Les techniques utilisees ont ete la fluorescence induite par laser (fil), l'emission thermique et la spectrometrie par transformee de fourier (stf). Les spectres fil ont ete obtenus a partir de l'excitation laser mono-mode fournie par les lasers suivants : ti : sapphire, generation de deuxieme harmonique du ti:sapphire et colorant. Des excitations multi-modes des lasers ar + et kr + ont egalement ete utilisees. Les spectres ont ete enregistres par un spectrometre de fourier de 2 metres de difference de chemin optique, developpe au laboratoire aime cotton. La source de molecules etait un caloduc, chauffe vers 800 degres (fil) et 1200 degres (emission thermique). La region spectrale d'enregistrement a ete comprise entre 8000 et 20 000 cm 1 avec une resolution non apodisee comprise entre 0. 005 et 0. 02 cm 1. Les nombres d'onde ont ete calibres en utilisant une longueur d'onde de reference fixe (transition atomique du xe vers 3. 5 m) utilisee pour mesurer la difference du chemin optique dans l'interferometre. L'incertitude absolue des mesures de nombres d'ondes varie de 1 10 3 cm 1 pour les raies les plus intenses jusqu'a 5 10 3 cm 1 pour les plus faibles. Nous avons observe et attribue plus de 8 000 transitions englobant sept etats electroniques et dix systemes de bandes : a 2-x 2 +, b 2 +x 2 +, c 2a 2, c 2a 2, c 2b 2 +, c 2x 2 +, d 2 + d 2 + a 2, g 2 + b 2 +, g 2 + a 2. Les resultats anterieurs de c. A. Leach, a. A. Tsekouras, and r. N. Zare (j. Of mol. Spectrosc. 153, 59-72 (1992) ont ete ajoutes aux donnees obtenues dans ce travail. Un ensemble de constantes moleculaires a ete obtenu pour les etats x 2 +, b 2 +, a 2, a 2, c 2, e 2 +, ainsi que seize termes d'energie pour l'etat g 2 +. Ces constantes moleculaires permettent de reproduire toutes les donnees experimentales, avec une precision de 3 10 3 cm 1.
Author Institution: Laboratoire de Spectrom\'{e}trie Ionique et Mol\'{e}culaire (UMR 5579... more Author Institution: Laboratoire de Spectrom\'{e}trie Ionique et Mol\'{e}culaire (UMR 5579 CNRS), B\^{a}timent Kastler, Universit\'{e} Lyon I, Domaine Scientifique de la Doua; Department of Physics, Temple University; Department of Modern Applied Physics, Tsinghua University; Department of Physics and Astronomy, State University of New York; Laboratoire Aim\'{e} Cotton (CNRS UPR3321), Campus d'Orsay; Energetic Materials Center.Lawrence Livermore National Laboratory, University of California
Journal of Physics B: Atomic, Molecular and Optical Physics, 1993
ABSTRACT Laser-induced fluorescence was observed in the BaCl molecule using various Ar+ and Kr+ i... more ABSTRACT Laser-induced fluorescence was observed in the BaCl molecule using various Ar+ and Kr+ ion laser radiations. The spectra were recorded by high resolution Fourier transform spectroscopy. The following electronic transitions were rotationally analysed for vibrational levels up to nu = 10: C 2 Pi to X 2 Sigma +, C 2 Pi to A' 2 Delta , C 2 Pi to A 2 Pi , C 2 Pi to B 2 Sigma +, B 2 Sigma + to X 2 Sigma +, E 2 Sigma + to C 2 Pi , E 2 Sigma + to B 2 Sigma +, F 2 Sigma + to C 2 Pi , F 2 Sigma + to A 2 Pi , F 2 Sigma + to B 2 Sigma +. A global fit was performed, including simultaneously all the data for these transitions. Accurate molecular constants are derived for the X 2 Sigma +, A' 2 Delta , A 2 Pi , B 2 Sigma +, C 2 Pi , E 2 Sigma + and F 2 Sigma + electronic states.
Abstract The emission spectrum of P2 was investigated in the 0.8–3-μm spectral region with a high... more Abstract The emission spectrum of P2 was investigated in the 0.8–3-μm spectral region with a high resolution Fourier spectrometer. Analysis of a new system attributed to the A 1 Π g → A′ 1 Σ u − transition is reported. The molecular parameters were determined from the whole set of wavenumbers using a complete fitting procedure. We obtain for the new A′ 1 Σ u − state:
We have performed photoassociative spectroscopy of cold Cs atoms in a vapor-cell magnetooptical t... more We have performed photoassociative spectroscopy of cold Cs atoms in a vapor-cell magnetooptical trap, within 10 cm 21 below the dissociation limit 6s 2 S 1͞2 1 6p 2 P 3͞2. Our detection method is based on pulsed-laser photoionization of Cs 2 molecules, selectively detected through a time-offlight mass spectrometer. Temporal and spatial analysis of Cs 1 2 ions show for the first time the formation of translationally cold Cs 2 triplet ground state molecules, at a temperature T ϳ 300 mK.
High resolution spectra of the 1-0, 2-0, 3-0, and 4-0 infra-red absorption bands of the two isoto... more High resolution spectra of the 1-0, 2-0, 3-0, and 4-0 infra-red absorption bands of the two isotopic species of deuterium bromide have been recorded up to very high J values. The equilibrium molecular parameters obtained in the analysis fit the 267 observed lines within their experimental uncertainties, and give precise calculated wavenumbers for some observed chemical laser lines of these
Author Institution: Laboratoire de Physique Mol\'{e}Aculaire et d'Optique Atmospherique; ... more Author Institution: Laboratoire de Physique Mol\'{e}Aculaire et d'Optique Atmospherique; Laboratoire de Spectrom\'{e}trie Ionique et Moleculaire, Universit\'{e} de Lyon; Laboratoire d'Infrarouge, Universit\'{e} de Paris XI
Abstract The investigation of the emission infrared spectrum of P 2 was performed with a high res... more Abstract The investigation of the emission infrared spectrum of P 2 was performed with a high resolution Fourier spectrometer. Two new electronic systems were attributed to b 3 Π g → w 3 Δ u and A 1 Π g → W 1 Δ u transitions. The molecular parameters are obtained by a complete fitting procedure. The main equilibrium constants of the new states are (in cm −1 ): ω 3 Δ u T e = 243228.07 ω e = 591.3 ω e X e = 2.5 B e = 0.256040 δ e = 0.001409 D e = 19.0 X 10 −8 W 1 Δ u T e = 31096.64 W e = 627.206 W e X e = 2.331 B e = 0.2628 δ e = 0.0014 D e = 23 X 10 −8
The analysis of high resolution Fourier spectra (2.5 × 10−3 cm−1) led to accurate molecular const... more The analysis of high resolution Fourier spectra (2.5 × 10−3 cm−1) led to accurate molecular constants for the vibrational levels ν = 0, 1, 2 of the X2Π state of 14N16O and of the levels ν = 0, 1 of the X2Π state of 14N17O, 14N18O, and 15N16O. A computer program has been written to directly reduce the data. It is shown that the expected variations for the different parameters with isotope substitution are well verified. Values of AJ(e) and γe are determined and discussed.
Ultraviolet lines of both krypton-ion and argon-ion lasers excite levels in the C(2)'& state of N... more Ultraviolet lines of both krypton-ion and argon-ion lasers excite levels in the C(2)'& state of Nal. Following efftcient collisional transfer to (1)'4, the (O-O) sequence of the (I)'4-B(l)'lT. system appears strongly in the infrared around 7020 cm-'. High-resolution Fourier transform spectra have been analysed to derive constants of the '4 state, for which T.= 27338.46 cm-'. Itsproperties, with or,= 130.0 cm-', !3,=0.1255 cm-', L&=7857 cm-', anda quantum defect ofalmost zero,are somewayfrom those of a pure Rydberg state.
The (0-0), (1-0), and (2-0) bands of the B3Pig-->A3Sigmau+ emission system of 14N2 and 15N2 ha... more The (0-0), (1-0), and (2-0) bands of the B3Pig-->A3Sigmau+ emission system of 14N2 and 15N2 have been recorded under high resolution with a Fourier transform interferometer. The whole set of wavenumbers has been reduced to molecular parameters by a complete fitting procedure. The molecular constants for the v = 0, 1, 2 levels of the B3Pig state and for the v = 0 level of the A3Sigmau+ state have been computed and tabulated; equilibrium constants have been derived for the B3Pig state.
... In the first experiment [8], the cold Cs atoms were continuously illuminated by the beam of a... more ... In the first experiment [8], the cold Cs atoms were continuously illuminated by the beam of a diode laser (λ ∼ 852 nm, SDL 5712-H1, 100 ... of the photoassociative process is detected by ionization of the cold molecules into Cs+ 2 , using a pulsed dye laser (dye: LDS 722; pulse ...
Near-infrared and visible spectra of the A(2)Pi-X(2)Sigma(+), C(2)Pi(1/2)-A(2)Pi(1/2), C(2)Pi(1/2... more Near-infrared and visible spectra of the A(2)Pi-X(2)Sigma(+), C(2)Pi(1/2)-A(2)Pi(1/2), C(2)Pi(1/2)-B(2)Sigma(+), and C(2)Pi(1/2)-X(2)Sigma(+) band systems of the BaI molecule were recorded by using Fourier transform spectroscopy (FTS). The spectra were produced from the chemiluminescent reaction Ba + I(2) and also by using laser-induced fluorescence (LIF) technique in which the laser sources were a Ti:sapphire single-mode laser, a dye single-mode laser, and a Kr(+) multimode ion laser. Resolved rotational data, originating from 19 vibrational levels (0 </= v </= 5 and 7 </= v </= 19) of the A(2)Pi state, 24 vibrational levels (0 </= v </= 18 and 20 </= v </= 24) of the X(2)Sigma(+) state, and 8 vibrational levels (1 </= v </= 2 and 9 </= v </= 14) of the C(2)Pi state, were used in the final analysis. Previously recorded data for the B(2)Sigma(+)-X(2)Sigma(+) and C(2)Pi-X(2)Sigma(+) systems, taken from R. F. Gutterres, J. Vergès, and C. Amiot, J. Mol. Spectrosc. 196, 29-44 (1999) and from C. A. Leach, A. A. Tsekouras, and R. N. Zare, J. Mol. Spectrosc. 153, 59-72 (1992), were added to the present work data field. Accurate and improved molecular constants, for the X(2)Sigma(+), B(2)Sigma(+), A(2)Pi, and C(2)Pi states, were derived from a simultaneous treatment of the whole data set. Copyright 2000 Academic Press.
Ce memoire presente une large etude sur la spectroscopie du radical libre bai. La partie experime... more Ce memoire presente une large etude sur la spectroscopie du radical libre bai. La partie experimentale a ete developpee au laboratoire aime cotton a orsay. Les techniques utilisees ont ete la fluorescence induite par laser (fil), l'emission thermique et la spectrometrie par transformee de fourier (stf). Les spectres fil ont ete obtenus a partir de l'excitation laser mono-mode fournie par les lasers suivants : ti : sapphire, generation de deuxieme harmonique du ti:sapphire et colorant. Des excitations multi-modes des lasers ar + et kr + ont egalement ete utilisees. Les spectres ont ete enregistres par un spectrometre de fourier de 2 metres de difference de chemin optique, developpe au laboratoire aime cotton. La source de molecules etait un caloduc, chauffe vers 800 degres (fil) et 1200 degres (emission thermique). La region spectrale d'enregistrement a ete comprise entre 8000 et 20 000 cm 1 avec une resolution non apodisee comprise entre 0. 005 et 0. 02 cm 1. Les nombres d'onde ont ete calibres en utilisant une longueur d'onde de reference fixe (transition atomique du xe vers 3. 5 m) utilisee pour mesurer la difference du chemin optique dans l'interferometre. L'incertitude absolue des mesures de nombres d'ondes varie de 1 10 3 cm 1 pour les raies les plus intenses jusqu'a 5 10 3 cm 1 pour les plus faibles. Nous avons observe et attribue plus de 8 000 transitions englobant sept etats electroniques et dix systemes de bandes : a 2-x 2 +, b 2 +x 2 +, c 2a 2, c 2a 2, c 2b 2 +, c 2x 2 +, d 2 + d 2 + a 2, g 2 + b 2 +, g 2 + a 2. Les resultats anterieurs de c. A. Leach, a. A. Tsekouras, and r. N. Zare (j. Of mol. Spectrosc. 153, 59-72 (1992) ont ete ajoutes aux donnees obtenues dans ce travail. Un ensemble de constantes moleculaires a ete obtenu pour les etats x 2 +, b 2 +, a 2, a 2, c 2, e 2 +, ainsi que seize termes d'energie pour l'etat g 2 +. Ces constantes moleculaires permettent de reproduire toutes les donnees experimentales, avec une precision de 3 10 3 cm 1.
Author Institution: Laboratoire de Spectrom\'{e}trie Ionique et Mol\'{e}culaire (UMR 5579... more Author Institution: Laboratoire de Spectrom\'{e}trie Ionique et Mol\'{e}culaire (UMR 5579 CNRS), B\^{a}timent Kastler, Universit\'{e} Lyon I, Domaine Scientifique de la Doua; Department of Physics, Temple University; Department of Modern Applied Physics, Tsinghua University; Department of Physics and Astronomy, State University of New York; Laboratoire Aim\'{e} Cotton (CNRS UPR3321), Campus d'Orsay; Energetic Materials Center.Lawrence Livermore National Laboratory, University of California
Journal of Physics B: Atomic, Molecular and Optical Physics, 1993
ABSTRACT Laser-induced fluorescence was observed in the BaCl molecule using various Ar+ and Kr+ i... more ABSTRACT Laser-induced fluorescence was observed in the BaCl molecule using various Ar+ and Kr+ ion laser radiations. The spectra were recorded by high resolution Fourier transform spectroscopy. The following electronic transitions were rotationally analysed for vibrational levels up to nu = 10: C 2 Pi to X 2 Sigma +, C 2 Pi to A' 2 Delta , C 2 Pi to A 2 Pi , C 2 Pi to B 2 Sigma +, B 2 Sigma + to X 2 Sigma +, E 2 Sigma + to C 2 Pi , E 2 Sigma + to B 2 Sigma +, F 2 Sigma + to C 2 Pi , F 2 Sigma + to A 2 Pi , F 2 Sigma + to B 2 Sigma +. A global fit was performed, including simultaneously all the data for these transitions. Accurate molecular constants are derived for the X 2 Sigma +, A' 2 Delta , A 2 Pi , B 2 Sigma +, C 2 Pi , E 2 Sigma + and F 2 Sigma + electronic states.
Abstract The emission spectrum of P2 was investigated in the 0.8–3-μm spectral region with a high... more Abstract The emission spectrum of P2 was investigated in the 0.8–3-μm spectral region with a high resolution Fourier spectrometer. Analysis of a new system attributed to the A 1 Π g → A′ 1 Σ u − transition is reported. The molecular parameters were determined from the whole set of wavenumbers using a complete fitting procedure. We obtain for the new A′ 1 Σ u − state:
We have performed photoassociative spectroscopy of cold Cs atoms in a vapor-cell magnetooptical t... more We have performed photoassociative spectroscopy of cold Cs atoms in a vapor-cell magnetooptical trap, within 10 cm 21 below the dissociation limit 6s 2 S 1͞2 1 6p 2 P 3͞2. Our detection method is based on pulsed-laser photoionization of Cs 2 molecules, selectively detected through a time-offlight mass spectrometer. Temporal and spatial analysis of Cs 1 2 ions show for the first time the formation of translationally cold Cs 2 triplet ground state molecules, at a temperature T ϳ 300 mK.
High resolution spectra of the 1-0, 2-0, 3-0, and 4-0 infra-red absorption bands of the two isoto... more High resolution spectra of the 1-0, 2-0, 3-0, and 4-0 infra-red absorption bands of the two isotopic species of deuterium bromide have been recorded up to very high J values. The equilibrium molecular parameters obtained in the analysis fit the 267 observed lines within their experimental uncertainties, and give precise calculated wavenumbers for some observed chemical laser lines of these
Author Institution: Laboratoire de Physique Mol\'{e}Aculaire et d'Optique Atmospherique; ... more Author Institution: Laboratoire de Physique Mol\'{e}Aculaire et d'Optique Atmospherique; Laboratoire de Spectrom\'{e}trie Ionique et Moleculaire, Universit\'{e} de Lyon; Laboratoire d'Infrarouge, Universit\'{e} de Paris XI
Abstract The investigation of the emission infrared spectrum of P 2 was performed with a high res... more Abstract The investigation of the emission infrared spectrum of P 2 was performed with a high resolution Fourier spectrometer. Two new electronic systems were attributed to b 3 Π g → w 3 Δ u and A 1 Π g → W 1 Δ u transitions. The molecular parameters are obtained by a complete fitting procedure. The main equilibrium constants of the new states are (in cm −1 ): ω 3 Δ u T e = 243228.07 ω e = 591.3 ω e X e = 2.5 B e = 0.256040 δ e = 0.001409 D e = 19.0 X 10 −8 W 1 Δ u T e = 31096.64 W e = 627.206 W e X e = 2.331 B e = 0.2628 δ e = 0.0014 D e = 23 X 10 −8
The analysis of high resolution Fourier spectra (2.5 × 10−3 cm−1) led to accurate molecular const... more The analysis of high resolution Fourier spectra (2.5 × 10−3 cm−1) led to accurate molecular constants for the vibrational levels ν = 0, 1, 2 of the X2Π state of 14N16O and of the levels ν = 0, 1 of the X2Π state of 14N17O, 14N18O, and 15N16O. A computer program has been written to directly reduce the data. It is shown that the expected variations for the different parameters with isotope substitution are well verified. Values of AJ(e) and γe are determined and discussed.
Ultraviolet lines of both krypton-ion and argon-ion lasers excite levels in the C(2)'& state of N... more Ultraviolet lines of both krypton-ion and argon-ion lasers excite levels in the C(2)'& state of Nal. Following efftcient collisional transfer to (1)'4, the (O-O) sequence of the (I)'4-B(l)'lT. system appears strongly in the infrared around 7020 cm-'. High-resolution Fourier transform spectra have been analysed to derive constants of the '4 state, for which T.= 27338.46 cm-'. Itsproperties, with or,= 130.0 cm-', !3,=0.1255 cm-', L&=7857 cm-', anda quantum defect ofalmost zero,are somewayfrom those of a pure Rydberg state.
The (0-0), (1-0), and (2-0) bands of the B3Pig-->A3Sigmau+ emission system of 14N2 and 15N2 ha... more The (0-0), (1-0), and (2-0) bands of the B3Pig-->A3Sigmau+ emission system of 14N2 and 15N2 have been recorded under high resolution with a Fourier transform interferometer. The whole set of wavenumbers has been reduced to molecular parameters by a complete fitting procedure. The molecular constants for the v = 0, 1, 2 levels of the B3Pig state and for the v = 0 level of the A3Sigmau+ state have been computed and tabulated; equilibrium constants have been derived for the B3Pig state.
... In the first experiment [8], the cold Cs atoms were continuously illuminated by the beam of a... more ... In the first experiment [8], the cold Cs atoms were continuously illuminated by the beam of a diode laser (λ ∼ 852 nm, SDL 5712-H1, 100 ... of the photoassociative process is detected by ionization of the cold molecules into Cs+ 2 , using a pulsed dye laser (dye: LDS 722; pulse ...
Near-infrared and visible spectra of the A(2)Pi-X(2)Sigma(+), C(2)Pi(1/2)-A(2)Pi(1/2), C(2)Pi(1/2... more Near-infrared and visible spectra of the A(2)Pi-X(2)Sigma(+), C(2)Pi(1/2)-A(2)Pi(1/2), C(2)Pi(1/2)-B(2)Sigma(+), and C(2)Pi(1/2)-X(2)Sigma(+) band systems of the BaI molecule were recorded by using Fourier transform spectroscopy (FTS). The spectra were produced from the chemiluminescent reaction Ba + I(2) and also by using laser-induced fluorescence (LIF) technique in which the laser sources were a Ti:sapphire single-mode laser, a dye single-mode laser, and a Kr(+) multimode ion laser. Resolved rotational data, originating from 19 vibrational levels (0 </= v </= 5 and 7 </= v </= 19) of the A(2)Pi state, 24 vibrational levels (0 </= v </= 18 and 20 </= v </= 24) of the X(2)Sigma(+) state, and 8 vibrational levels (1 </= v </= 2 and 9 </= v </= 14) of the C(2)Pi state, were used in the final analysis. Previously recorded data for the B(2)Sigma(+)-X(2)Sigma(+) and C(2)Pi-X(2)Sigma(+) systems, taken from R. F. Gutterres, J. Vergès, and C. Amiot, J. Mol. Spectrosc. 196, 29-44 (1999) and from C. A. Leach, A. A. Tsekouras, and R. N. Zare, J. Mol. Spectrosc. 153, 59-72 (1992), were added to the present work data field. Accurate and improved molecular constants, for the X(2)Sigma(+), B(2)Sigma(+), A(2)Pi, and C(2)Pi states, were derived from a simultaneous treatment of the whole data set. Copyright 2000 Academic Press.
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