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The a1Δg(a2g)→X3Σ−g(X21g) transition of Se2

✍ Scribed by K.D. Setzer; A. Dorn; M. Lorenz; E.H. Fink

Publisher
Elsevier Science
Year
2003
Tongue
English
Weight
170 KB
Volume
221
Category
Article
ISSN
0022-2852

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✦ Synopsis

Emission spectra of the 0-0 and 1-1 bands of the a 1 D g ða2 g Þ ! X 3 R À g ðX 2 1 g Þ magnetic dipole transition of Se 2 have been observed in the near-infrared spectral region near 3780 cm À1 . The Se 2 molecules were generated in a fast-flow system by passing Se x vapor in Ar carrier gas through a microwave discharge and were excited by electronic-to-electronic energy transfer from metastable singlet

were measured with a Fourier-transform spectrometer. By comparing the band shape of the 0-0 band of the a ! X 2 system with computer simulations, the following spectroscopic constants of the a 1 D g ða2 g Þ state of 80 Se 2 were derived (cm À1 ): T e ¼ 4303:7ð1Þ, B 0 ¼ 0:08888ð5Þ, and DG 1=2 ¼ 369:6ð2Þ, where the numbers in parentheses are estimated error limits of the parameters in units of the last digit.

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