Precise Molecular Constants for the 6Li2 A1 Σ+u-X1 Σ+g System by Sub-Doppler Polarization Spectroscopy

Xuejun Wang; Jie Yang; Jianbing Qi; A. Marjatta Lyyra

doi:10.1006/jmsp.1998.7645

Precise Molecular Constants for the ⁶Li₂ A¹ Σ⁺_u-X¹ Σ⁺_g System by Sub-Doppler Polarization Spectroscopy

Xuejun Wang, Jie Yang, Jianbing Qi, A. Marjatta Lyyra

Division of Science (Berks)

Research output: Contribution to journal › Article › peer-review

17 Scopus citations

Abstract

We report here new and more accurate molecular constants from sub-Doppler polarization spectroscopy of the A¹ Σ⁺_u-X¹ Σ⁺_g system of ⁶Li₂ using single mode cw dye lasers. These new constants cover the range of vibrational levels from ν″ = 0-8 in the ground state and ν′ = 0-24 in the excited state. New molecular constants and RKR potential energy curves for the A¹ Σ⁺_u and X¹ Σ⁺_g states are given. The T_e value for the A¹ Σ⁺_u state is 14068.043(34) cm^-1. The analysis indicates that there is a noticeable breakdown of the Born-Oppenheimer approximation for the ⁶Li₂ and ⁷Li₂ isotopomers.

Original language	English (US)
Pages (from-to)	295-305
Number of pages	11
Journal	Journal of molecular spectroscopy
Volume	191
Issue number	2
DOIs	https://doi.org/10.1006/jmsp.1998.7645
State	Published - Oct 1998

All Science Journal Classification (ASJC) codes

Atomic and Molecular Physics, and Optics
Spectroscopy
Physical and Theoretical Chemistry

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@article{c0d028edcc164bc286f2cf7d97462bf8,

title = "Precise Molecular Constants for the 6Li2 A1 Σ+u-X1 Σ+g System by Sub-Doppler Polarization Spectroscopy",

abstract = "We report here new and more accurate molecular constants from sub-Doppler polarization spectroscopy of the A1 Σ+u-X1 Σ+g system of 6Li2 using single mode cw dye lasers. These new constants cover the range of vibrational levels from ν″ = 0-8 in the ground state and ν′ = 0-24 in the excited state. New molecular constants and RKR potential energy curves for the A1 Σ+u and X1 Σ+g states are given. The Te value for the A1 Σ+u state is 14068.043(34) cm-1. The analysis indicates that there is a noticeable breakdown of the Born-Oppenheimer approximation for the 6Li2 and 7Li2 isotopomers.",

author = "Xuejun Wang and Jie Yang and Jianbing Qi and Lyyra, {A. Marjatta}",

note = "Funding Information: We wish to thank Professors Li Li, Colan Linton, William Stwalley, and Robert Le Roy and Drs. Mingguang Li, Bing Ji, and Kenneth Urbanski for helpful discussions. We are also grateful to Dr. Stiliana Antonova and Mr. Guenadiy Lazarov for their help with the experiment, and to Ed Kaczanowitz and Steve Stevenson for technical support. This work was supported by NSF.",

year = "1998",

month = oct,

doi = "10.1006/jmsp.1998.7645",

language = "English (US)",

volume = "191",

pages = "295--305",

journal = "Journal of molecular spectroscopy",

issn = "0022-2852",

publisher = "Academic Press Inc.",

number = "2",

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TY - JOUR

T1 - Precise Molecular Constants for the 6Li2 A1 Σ+u-X1 Σ+g System by Sub-Doppler Polarization Spectroscopy

AU - Wang, Xuejun

AU - Yang, Jie

AU - Qi, Jianbing

AU - Lyyra, A. Marjatta

N1 - Funding Information: We wish to thank Professors Li Li, Colan Linton, William Stwalley, and Robert Le Roy and Drs. Mingguang Li, Bing Ji, and Kenneth Urbanski for helpful discussions. We are also grateful to Dr. Stiliana Antonova and Mr. Guenadiy Lazarov for their help with the experiment, and to Ed Kaczanowitz and Steve Stevenson for technical support. This work was supported by NSF.

PY - 1998/10

Y1 - 1998/10

N2 - We report here new and more accurate molecular constants from sub-Doppler polarization spectroscopy of the A1 Σ+u-X1 Σ+g system of 6Li2 using single mode cw dye lasers. These new constants cover the range of vibrational levels from ν″ = 0-8 in the ground state and ν′ = 0-24 in the excited state. New molecular constants and RKR potential energy curves for the A1 Σ+u and X1 Σ+g states are given. The Te value for the A1 Σ+u state is 14068.043(34) cm-1. The analysis indicates that there is a noticeable breakdown of the Born-Oppenheimer approximation for the 6Li2 and 7Li2 isotopomers.

AB - We report here new and more accurate molecular constants from sub-Doppler polarization spectroscopy of the A1 Σ+u-X1 Σ+g system of 6Li2 using single mode cw dye lasers. These new constants cover the range of vibrational levels from ν″ = 0-8 in the ground state and ν′ = 0-24 in the excited state. New molecular constants and RKR potential energy curves for the A1 Σ+u and X1 Σ+g states are given. The Te value for the A1 Σ+u state is 14068.043(34) cm-1. The analysis indicates that there is a noticeable breakdown of the Born-Oppenheimer approximation for the 6Li2 and 7Li2 isotopomers.

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DO - 10.1006/jmsp.1998.7645

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JF - Journal of molecular spectroscopy

IS - 2

ER -

Precise Molecular Constants for the ⁶Li₂ A¹ Σ⁺_u-X¹ Σ⁺_g System by Sub-Doppler Polarization Spectroscopy

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