The absorption spectrum of Cl2 in the vacuum ultraviolet

1981 ◽  
Vol 59 (6) ◽  
pp. 835-840 ◽  
Author(s):  
A. E. Douglas
Keyword(s):  
Absorption Spectrum ◽  
Vacuum Ultraviolet ◽  
Band System ◽  
Rydberg States ◽  
Ultraviolet Region ◽  
Isotopic Molecule ◽  
Vacuum Ultraviolet Region ◽  
Vibrational Constants ◽  
Made In

The absorption spectrum of Cl2 in the vacuum ultraviolet region has been photographed with sufficient resolution to allow rotational analyses of many bands. The separated isotopic molecule 35Cl2 and cooled absorption cells were used to simplify the spectrum. A band system associated with an ionic state has been observed in the 1330–1450 Å range. Many large perturbations in the system prevent the determination of the usual rotational and vibrational constants. Some progress has been made in the analyses of a few bands associated with Rydberg states.

Absorption spectrum and absorption coefficients of NO2 in the vacuum ultraviolet region

1978 ◽  
Vol 56 (7) ◽  
pp. 962-973 ◽  
Author(s):  
Yumio Morioka ◽  
Harunobu Masuko ◽  
Masatoshi Nakamura ◽  
Michio Sasanuma ◽  
Eiji Ishiguro
Keyword(s):  
Absorption Spectrum ◽  
Vacuum Ultraviolet ◽  
Rydberg States ◽  
Ultraviolet Region ◽  
Photographic Method ◽  
Rydberg Series ◽  
Absorption Coefficients ◽  
Electron Synchrotron ◽  
Ionic State ◽  
Vacuum Ultraviolet Region

The absorption coefficients of NO2 in the region from 500 to 1100 Å are measured by a photographic method using the radiation from electron synchrotron as a background source. For the Rydberg series due to the transition from 4a1 to npπ, parameters q and Γ in Mies equation are obtained and the parameter q is determined to be −0.4 for every member and Γ 4.808/n*3 eV where n* is the effective quantum number.The absorption spectrum of NO2 in the region from 600 to 1600 Å are also analyzed. New vibrational progressions that are observed around 950 Å, are assigned to the excitations from 4b2 to ns Rydberg states (n = 3, 4, and 5) converging to the 1B2 ionic state. Assignments and discussions of many other Rydberg series that appear in the absorption spectrum between 600 and 1600 Å are also presented.

New electronic transitions of the C2 molecule in absorption in the vacuum ultraviolet region

1969 ◽  
Vol 47 (24) ◽  
pp. 2735-2743 ◽  
Author(s):  
G. Herzberg ◽  
A. Lagerqvist ◽  
C. Malmberg
Keyword(s):  
Ground State ◽  
Vacuum Ultraviolet ◽  
Rydberg States ◽  
The Other ◽  
Electronic Transitions ◽  
Lower State ◽  
Ultraviolet Region ◽  
New States ◽  
Vacuum Ultraviolet Region ◽  
Vibrational Constants

Three new electronic transitions of the C2 molecule have been observed in absorption in the region 1300–1450 Å. The system of shortest wavelength is readily identified as a 1Πu–1Σg+ transition; the lower state is the ground state X1Σg+ of the molecule. The other two systems arise by absorption from the low-lying a3Πu state; the upper states are new 3Σg− and 3Δg states. Rotational and vibrational constants of the three new states have been determined. The new states are Rydberg states. Their correlation to the separated atoms is briefly discussed.

Absorption spectrum of vapor phase azulene in vacuum ultraviolet region

1966 ◽  
Vol 19 (1-4) ◽  
pp. 1-3 ◽  
Author(s):  
Taiji Kitagawa ◽  
Yoshiya Harada ◽  
Hiroo Inokuchi ◽  
Kumasaburo Kodera
Keyword(s):  
Absorption Spectrum ◽  
Vapor Phase ◽  
Vacuum Ultraviolet ◽  
Ultraviolet Region ◽  
Vacuum Ultraviolet Region

THE ABSORPTION SPECTRUM OF DBr IN THE VACUUM ULTRAVIOLET REGION

1962 ◽  
Vol 40 (10) ◽  
pp. 1279-1293 ◽  
Author(s):  
J. G. Stamper
Keyword(s):  
Absorption Spectrum ◽  
Vacuum Ultraviolet ◽  
High Dispersion ◽  
Ultraviolet Region ◽  
Isotopic Species ◽  
Vacuum Ultraviolet Region ◽  
The Relationship

The absorption spectrum of DBr has been photographed under high dispersion in the vacuum ultraviolet region. More than 30 bands have been observed and rotational analyses have been obtained for most of them. As is the case for HBr, little regularity is to be found among the various bands and the relationship between the spectra of the two isotopic species is frequently unclear. It has therefore not proved possible to arrive at any detailed conclusions as to the nature of the upper states of the bands.

The absorption spectrum of trans-diimide (N2H2) in the vacuum ultraviolet region

1981 ◽  
Vol 59 (3) ◽  
pp. 506-517 ◽  
Author(s):  
P. S. Neudorfl ◽  
R. A. Back ◽  
A. E. Douglas
Keyword(s):  
Absorption Spectrum ◽  
Gas Phase ◽  
Vacuum Ultraviolet ◽  
Singlet State ◽  
Ultraviolet Region ◽  
Ultraviolet Absorption Spectrum ◽  
Rotational Analysis ◽  
Trans Conformation ◽  
Vacuum Ultraviolet Region ◽  
Rydberg Transitions

The vacuum ultraviolet absorption spectrum of trans-diimide (N2H2) in the gas phase has been re-examined between 1800 and 1300 Å, using diimide prepared by the thermal decomposition of sodium tosylhydrazide. Two band systems were observed, designated [Formula: see text] and [Formula: see text], with origins at 1727 and 1473 Å, which have been assigned to the Rydberg transitions 3pπ(bu) ← n+ and 4pπ(bu) ← n+ respectively. Both systems show long progressions in v2′, the N—N—H symmetric bending frequency, and short progressions in v3′, the symmetric N—N stretching frequency.The [Formula: see text] system has well-resolved rotational J type structure in some bands, and the rotational analysis showed that the ground state is a totally symmetric singlet state of C2h symmetry (planar trans-N2H2 isomer), and that the system arises from a 1Bu ← 1Ag transition. Rotational constants obtained for the 0–0 band of the [Formula: see text]-state were A = 15.63, B = 1.32, and C = 1.22 cm−1, and the values of rH−N = 1.028 Å, rH−N = 1.167 Å, and [Formula: see text] were estimated from them assuming a planar trans conformation.

Absorption Spectrum of Se I in the Vacuum Ultraviolet Region

1983 ◽  
Vol 27 (1) ◽  
pp. 59-63 ◽  
Author(s):  
A M Cantú ◽  
M Mazzoni ◽  
Y N Joshi
Keyword(s):  
Absorption Spectrum ◽  
Vacuum Ultraviolet ◽  
Ultraviolet Region ◽  
Vacuum Ultraviolet Region

The electronic spectra of HCl and HF

1979 ◽  
Vol 57 (10) ◽  
pp. 1650-1661 ◽  
Author(s):  
A. E. Douglas ◽  
F. R. Greening
Keyword(s):  
Absorption Spectra ◽  
Electronic Spectra ◽  
Vacuum Ultraviolet ◽  
Rydberg States ◽  
Spectral Lines ◽  
High Dispersion ◽  
Ultraviolet Region ◽  
Vibrational Levels ◽  
Vacuum Ultraviolet Region ◽  
Ionization Limit

The absorption spectra of HCl and HF have been photographed at high dispersion in the vacuum ultraviolet region. In the HCl spectrum, many new band systems have been identified and 18 vibrational levels of the ionic B1Σ state have been observed. The B1Σ state is found to interact strongly with the Rydberg states. Although many bands have been analysed, much of the HCl spectrum remains unassigned. Analyses of bands associated with the lowest discrete 1Π and 3Π states of HF are presented together with the analyses of two 1Π–X1Σ band systems which lie between the first and second ionization limit. The spectrum of HF is very complex and little of it has been analysed even though the spectral lines are sharp and well resolved. The theoretical problems in understanding the spectra of HCl and HF are discussed.

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