The Ultraviolet Absorption Spectrum of Furazan

1972 ◽  
Vol 50 (13) ◽  
pp. 2088-2091 ◽  
Author(s):  
B. J. Forrest ◽  
A. W. Richardson
Keyword(s):  
Absorption Spectrum ◽  
Excited State ◽  
Potential Barrier ◽  
Ground State ◽  
Ultraviolet Absorption ◽  
Ultraviolet Absorption Spectrum

The ultraviolet absorption spectrum of furazan (1,2,5-oxadiazole) in the region 2500–2300 Å has been recorded and analyzed as a π→π* transition from the planar ground state to a non-planar excited state having a potential barrier to planarity of about 215 cm−1.

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 ultraviolet absorption spectrum of the F 2 CN radical

1967 ◽  
Vol 300 (1462) ◽  
pp. 405-414 ◽  
Keyword(s):  
Molecular Structure ◽  
Absorption Spectrum ◽  
Ground State ◽  
Flash Photolysis ◽  
Ultraviolet Absorption ◽  
Ultraviolet Absorption Spectrum ◽  
Rotational Analysis ◽  
Absorption Bands ◽  
New System

A new system of absorption bands near 3600 Å has been observed during the flash photolysis of CF 3 NCF 2 and is ascribed to the free F 2 CN radical. The rotational analysis of the 0–0 band leads to the ground state molecular structure r CF = 1.310 Å (assumed), r CN = 1.265 ± 0.02 Å, FCF angle = 113.5 + 1°. The bands are shown to be type A bands arising from the transition 2 A 1 ← 2 B 2 , and the spectrum is compared with those of the iso-electronic molecules NO 3 and F 2 BO.

THE NEAR ULTRAVIOLET ABSORPTION SPECTRUM OF 1,2,4-TRIFLUOROBENZENE VAPOR

1957 ◽  
Vol 35 (3) ◽  
pp. 332-340 ◽  
Author(s):  
K. Narahari Rao ◽  
H. Sponer
Keyword(s):  
Absorption Spectrum ◽  
Excited State ◽  
Ultraviolet Absorption ◽  
Ultraviolet Absorption Spectrum ◽  
Vibrational Modes ◽  
Near Ultraviolet ◽  
Bond Stretching

The vapor spectrum of 1,2,4-trifluorobenzene at 2810–2460 Å was obtained with a 3 meter grating in an Eagle mounting. The band at 37126 cm−1 was taken as the 0–0 band of the A′—A′ transition. The excited state vibrations 698, 746, 1274, and 1369 cm−1, which are totally symmetric, appear in progressions and combinations. Their correlation to vibrational modes is discussed. The 1274 belongs to a C—F bond stretching mode. Possibilities are discussed to explain the structure of the first group upon which the spectrum is built.

Vacuum ultraviolet absorption spectrum of p-benzoquinone

1986 ◽  
Vol 82 (3) ◽  
pp. 367 ◽  
Author(s):  
Paul Brint ◽  
Jean-Patrick Connerade ◽  
Pericles Tsekeris ◽  
Agisilaos Bolovinos ◽  
Aslam Baig
Keyword(s):  
Absorption Spectrum ◽  
Vacuum Ultraviolet ◽  
Ultraviolet Absorption ◽  
Ultraviolet Absorption Spectrum

The ultraviolet absorption spectrum as a criterion of the type of solubilization

1958 ◽  
Vol 13 (3) ◽  
pp. 208-217 ◽  
Author(s):  
S Riegelman ◽  
N.A Allawala ◽  
M.K Hrenoff ◽  
L.A Strait
Keyword(s):  
Absorption Spectrum ◽  
Ultraviolet Absorption ◽  
Ultraviolet Absorption Spectrum
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