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.

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 of the H2S molecule in the vacuum ultraviolet region

1979 ◽  
Vol 57 (5) ◽  
pp. 745-760 ◽  
Author(s):  
Harunobu Masuko ◽  
Yumio Morioka ◽  
Masatoshi Nakamura ◽  
Eiji Ishiguro ◽  
Michio Sasanuma
Keyword(s):  
Absorption Spectrum ◽  
Vacuum Ultraviolet ◽  
Theoretical Calculations ◽  
Broad Band ◽  
Ultraviolet Region ◽  
Coupling Scheme ◽  
Rydberg Series ◽  
Vibrationally Excited ◽  
Electron Synchrotron ◽  
Orbital Character

The optical absorption spectrum of the H2S molecule in the region from 2050 to 1150 Å has been studied by a photographic method, using the radiation from a 1.3-GeV electron synchrotron as a background source. Numerous bands including those due to dipole forbidden transitions are observed in the spectrum. Five types of Rydberg series are assigned to electronic transitions from the outermost 2b1 orbital to the d-like orbitals, three types to the p-like orbitals, and one type to the s-like orbital. The quantum defects of these transitions and a series limit of 84 417 ± 8 cm−1 (10.466 ± 0.001 eV) were determined using the extended Rydberg series. The first member of the A Rydberg series splits into four bands, which is discussed with jj coupling scheme. The upper state of the 2000-Å (6.20-eV) broad band is assigned to the (2b1)−1 (6a1/4sa1) 1B1 state which is predominantly of valence orbital character. Transitions to vibrationally excited state were also investigated and the limit to which the (100) vibrationally excited Rydberg series converges was determined to be 86 882 ± 20 cm−1 (10.772 ± 0.003 eV). The results obtained in this experiment are compared with theoretical calculations.

Absorption spectrum of the NO molecule. VIII. The heterogeneous (2Σ–2Π) interactions between excited states

1968 ◽  
Vol 46 (8) ◽  
pp. 987-1003 ◽  
Author(s):  
Ch. Jungen ◽  
E. Miescher
Keyword(s):  
Absorption Spectrum ◽  
High Resolution ◽  
Excited States ◽  
Rydberg State ◽  
Vacuum Ultraviolet ◽  
Principal Quantum Number ◽  
Rydberg States ◽  
Infrared Emission ◽  
Strong Interactions ◽  
Rydberg Series

Heterogeneous perturbations 2E+ ~ 2Π of largely different magnitudes are observed with high resolution in the vacuum-ultraviolet absorption and in the infrared emission spectrum of the NO molecule. The rotational interactions between 2Σ+ Rydberg states and levels of the B2Π non-Rydberg state are shown to be "configurationally forbidden", but produced by the configuration interaction between the non-Rydberg levels and 2Π Rydberg states. The latter together with the 2Σ+ Rydberg states form p complexes. In this way the interactions display the l uncoupling in the complexes; they can be evaluated theoretically and can be analyzed fully. The cases of the strong interactions D2Σ+(v = 3) ~ B2Π(v = 16)and D2Σ+(v = 5) ~ B2Π(v = 21) and of the weaker D2Σ+(v = 1) ~ B2Π(v = 11), all three observed as perturbations in ε bands crossing 3 bands, are discussed in detail. It is further shown that perturbations between γ bands and β bands as well as perturbations between analogous bands of higher principal quantum number are absent, and thus the assignment of the A2Σ+ and E2Σ+ states to the s Rydberg series is confirmed.

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.

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.

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.

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