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Emission Spectroscopy of the d1Σ+–b1Σ+, d1Σ+–X3Δ1, and e1Π–a1Δ Systems of VN

✍ Scribed by R.S. Ram; P.F. Bernath; S.P. Davis


Publisher
Elsevier Science
Year
2001
Tongue
English
Weight
307 KB
Volume
210
Category
Article
ISSN
0022-2852

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✦ Synopsis


The emission spectrum of VN has been investigated in the 3400-19 400 cm -1 region using a Fourier transform spectrometer. The bands were observed from the reaction of VOCl 3 vapor with active nitrogen. In addition to the previously known transitions of VN, several new bands observed in the visible and near infrared have been classified into two new electronic transitions, e 1 -a 1 and d 1 + -b 1 + . Four bands with origins near 5267. 49, 5290.48, 5318.86, and 5349.45 cm -1 have been identified as the 0-0, 1-1, 2-2, and 3-3 bands, respectively, of the d 1 + -b 1 + transition. The excited d 1 + state is known from the d 1 + -X 3 1 transition observed previously by B. Simard, C. Masoni, and P. A. Hackett (J. Mol. Spectrosc. 136, 44-55 (1989)). The d 1 + -X 3 1 transition has also been observed in our spectra. Another band with two P, two Q, and two R branches and band origin near 14 292.77 cm -1 has been assigned as the e 1 -a 1 transition. A rotational analysis of bands of the three transitions has been carried out and the spectroscopic constants have been evaluated. The principal spectroscopic constants for the a 1 state, which is most probably the lowest singlet state of VN, are B 0 = 0.634 804(31) cm -1 , D 0 = 9.03( 14) × 10 7 cm -1 , and r 0 = 1.554 891(38) Å, while the equilibrium rotational constants for the b 1 + state are B e = 0.617 896(26) cm -1 , α e = 0.004 148(19) cm -1 , and r e = 1.576 022(33) A . The d 1 + state is affected by interactions with a close-lying perturbing state.


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