Near ultraviolet absorption spectra of 3,4-dichloro- and 2,4-dibromofluorobenzene molecules in vapour state

1976 ◽  
Vol 73 ◽  
pp. 896-901 ◽  
Author(s):  
G. N. R. Tripathi ◽  
V. M. Pandey
Keyword(s):  
Absorption Spectra ◽  
Ultraviolet Absorption ◽  
Vapour State ◽  
Near Ultraviolet

scholarly journals The Near-ultraviolet Absorption Spectrum of Diimide Vapor

1974 ◽  
Vol 52 (6) ◽  
pp. 1006-1012 ◽  
Author(s):  
R. A. Back ◽  
C. Willis ◽  
D. A. Ramsay
Keyword(s):  
Absorption Spectrum ◽  
Bond Length ◽  
Gas Phase ◽  
Absorption Spectra ◽  
Ground State ◽  
Ultraviolet Absorption ◽  
Ultraviolet Absorption Spectrum ◽  
Near Ultraviolet ◽  
Bending Mode ◽  
Franck Condon

Absorption spectra of N2H2 and N2D2 in the gas phase have been obtained in the region 3000–4300 Å, consisting of about 30 diffuse bands for each compound. Long progressions in the spectra are attributed to excitation of the H—N=N bending mode, v2′, in the upper state, with much shorter progressions arising from the N=N stretching mode, v3′; values of v2′ = 1215 and 910 cm−1 and v3′ = 1550 and 1440 cm−1 were estimated for N2H2 and N2D2 respectively.The spectra are attributed to the 1Bg ← 1Ag(π* ← n+) transition of trans diimide, probably made allowed by vibronic interaction. From Franck–Condon calculations the H—N=N angle in the upper state was estimated to be 132 ± 2°, an increase of 25° from the ground-state value; the increase in the N=N bond length was estimated to be about 0.05 Å.

The Near Ultraviolet Absorption Spectra of the Diazines

1949 ◽  
Vol 17 (11) ◽  
pp. 1165-1166 ◽  
Author(s):  
Frederick Halverson ◽  
Robert C. Hirt
Keyword(s):  
Absorption Spectra ◽  
Ultraviolet Absorption ◽  
Near Ultraviolet
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