The 7390 Å band of NO2, a vibronically-induced transition within the ground state manifold

1977 ◽  
Vol 55 (23) ◽  
pp. 2101-2112 ◽  
Author(s):  
K-E. J. Hallin ◽  
A. J. Merer
Keyword(s):  
Ground State ◽  
Vibrational Energy ◽  
Rotational Constant ◽  
Spin Rotation ◽  
High Dispersion ◽  
Vibrational Assignment ◽  
Rotation Parameters ◽  
Momentum Coupling ◽  
Parallel Band ◽  
Diabatic Representation

About 160 rotational lines in the region 7370–7410 Å in the electronic spectrum of NO2 have been assigned from high dispersion grating spectra. The lines form the K = 0,1, and 2 sub-bands of a perturbed parallel band where the upper state A rotational constant is about 17 cm−1. In a diabatic representation the band can be considered as a transition within the ground state manifold, which obtains its intensity by vibrational momentum coupling from a nearby band of the [Formula: see text] electronic transition; its vibrational assignment is 2 13 1 – 000. Comparison with the spectrum of 15NO2 shows that the nearby Ã2B2 level has quite a small amount of vibrational energy, which is not inconsistent with the assignment by Brand, Chan, and Hardwick that the (0, 0) band of the [Formula: see text] transition is at 8350 Å. The implications of the electron spin–rotation parameters and the intensity of the 7390 Å band are discussed.

Rotational structure in the NO2 absorption spectrum between 8170 and 8280 Å

1978 ◽  
Vol 56 (11) ◽  
pp. 1502-1512 ◽  
Author(s):  
A. J. Merer ◽  
K-E. J. Hallin
Keyword(s):  
Absorption Spectrum ◽  
Ground State ◽  
Infrared Region ◽  
Zero Order ◽  
Rotational Structure ◽  
High Dispersion ◽  
Detailed Understanding ◽  
Level Densities ◽  
Momentum Coupling

Three parallel-polarized sub-bands, lying in the region 8170–8280 Å in the absorption spectrum of NO2, have been analysed rotationally from high dispersion grating spectra. These sub-bands are assigned as perturbed K = 0, 1, and 4 sub-bands of the [Formula: see text], which appear in absorption because of vibrational momentum coupling with the [Formula: see text], 030–000 band, which lies 137 cm−1 lower in energy. It is shown that in the photographic infrared region of the NO2 spectrum the level densities in the interacting [Formula: see text] and F[Formula: see text] states are sufficiently low that it is possible to identify progressions of vibronically-induced transitions that in zero order would be within the ground state manifold. The implications for a more detailed understanding of the NO2 spectrum are discussed.

Spin-Rotation Parameters and Phase-Shift Ambiguities inπ−NScattering

1967 ◽  
Vol 155 (5) ◽  
pp. 1744-1749 ◽  
Author(s):  
L. David Roper ◽  
David S. Bailey
Keyword(s):  
Phase Shift ◽  
Spin Rotation ◽  
Rotation Parameters

THE ABSORPTION SPECTRUM OF CF2

1967 ◽  
Vol 45 (7) ◽  
pp. 2355-2374 ◽  
Author(s):  
C. Weldon Mathews
Keyword(s):  
Absorption Spectrum ◽  
Electronic State ◽  
Ground State ◽  
Band System ◽  
Electronic States ◽  
Vibrational Structure ◽  
Rotational Structure ◽  
Transition Moment ◽  
High Dispersion ◽  
Parallel Type

The absorption spectrum of CF2 in the 2 500 Å region has been photographed at high dispersion, and the rotational structure of a number of bands has been analyzed. The analysis of the well-resolved subbands establishes that these are perpendicular- rather than parallel-type bands, as previously assigned. Further analysis shows that the upper and lower electronic states are of 1B1 and 1A1symmetries respectively, corresponding to a transition moment that is perpendicular to the plane of the molecule. In the upper electronic state, r0(CF) = 1.32 Å and [Formula: see text], while in the ground state, r0(CF) = 1.300 Å and [Formula: see text]. An investigation of the vibrational structure of the band system has shown that the vibrational numbering in ν2′ must be increased by one unit from earlier assignments, thus placing the 000–000 band near 2 687 Å (37 220 cm−1). A search between 1 300 and 8 500 Å showed two new band systems near 1 350 and 1 500 Å which have been assigned tentatively to the CF2 molecule.

Measurements of spin rotation parameters in pion-nucleon elastic scattering at 6 and at 16

1972 ◽  
Vol 40 (2) ◽  
pp. 277-280 ◽  
Author(s):  
A. De Lesquen ◽  
B. Amblard ◽  
R. Beurtey ◽  
G. Cozzika ◽  
J. Bystricky ◽  
...  
Keyword(s):  
Elastic Scattering ◽  
Spin Rotation ◽  
Pion Nucleon ◽  
Rotation Parameters

scholarly journals Probing the superconducting ground state of noncentrosymmetric high-entropy alloys using muon-spin rotation and relaxation

2021 ◽  
Vol 104 (9) ◽  
Author(s):  
Kapil Motla ◽  
Arushi ◽  
P. K. Meena ◽  
D. Singh ◽  
P. K. Biswas ◽  
...  
Keyword(s):  
Ground State ◽  
Muon Spin ◽  
Spin Rotation ◽  
Muon Spin Rotation ◽  
High Entropy Alloys ◽  
High Entropy

scholarly journals Methyl Internal Rotation Fine Structure in the Ground State Rotational Spectrum of Gauche Butane

1990 ◽  
Vol 45 (8) ◽  
pp. 989-994 ◽  
Author(s):  
Kirsten Vormann ◽  
Helmut Dreizler ◽  
Hans Hübner ◽  
Wolfgang Hüttner
Keyword(s):  
Fine Structure ◽  
Internal Rotation ◽  
Barrier Height ◽  
Ground State ◽  
High Accuracy ◽  
Rotational Spectrum ◽  
Frequency Range ◽  
Vibrational Ground State ◽  
Rotation Parameters

Abstract The methyl torsional fine structure in the rotational spectrum of gauche butane in the vibrational ground state was investigated in the frequency range between 10 and 141 GHz. Using the internal axis method (IAM) in the formulation of Woods, all internal rotation parameters were determined with high accuracy. The barrier height of the methyl internal rotation was determined to 11.34 (29) kJ/mol (2.710 (69) kcal/mol)

Electronic spectrum of D2O+

1987 ◽  
Vol 65 (7) ◽  
pp. 739-752 ◽  
Author(s):  
H. Lew ◽  
R. Groleau
Keyword(s):  
Bond Length ◽  
Ground State ◽  
Simple Formula ◽  
Bond Angle ◽  
Spin Rotation ◽  
Type B ◽  
Infrared Band ◽  
Asymmetric Rotor ◽  
Linear Molecules ◽  
Van Vleck

An analysis of 15 bands of the [Formula: see text] system of D2O+ is given. All assigned lines are tabulated. The rotational structures of the [Formula: see text], 1, and 3 levels of the ground state are fitted to the Watson asymmetric rotor Hamiltonian with added spin-rotation terms. For the upper state, the rotational structures of various substates are expressed: for [Formula: see text], in terms of a simple formula for linear molecules; and for [Formula: see text], 2, and 3, in terms of a modified Hill – Van Vleck formula given by Jungen, Hallin, and Merer. From the rotational constants of the ground state, term values are calculated and a small portion of a Type-B infrared band is derived. Some predicted microwave lines are also given. The bond length and bond angle of the molecule in the ground state (ν = 0) are r0 = 0.9987 ± 0.0002 Å and θ0 = 110.17 ± 0.02 deg.

THE b1Σ+–X3Σ− BAND SYSTEM OF NF

1966 ◽  
Vol 44 (10) ◽  
pp. 2251-2258 ◽  
Author(s):  
A. E. Douglas ◽  
W. E. Jones
Keyword(s):  
Ground State ◽  
Band System ◽  
High Dispersion ◽  
Rotational Analysis ◽  
Strong Band

If argon mixed with a small amount of NF3 is pumped rapidly through a mild discharge, a green glow is observed downstream from the discharge. This emission has been photographed with a high dispersion spectrograph and found to consist of a strong band with a head at 5 288 Å and a number of weaker bands. A rotational analysis of the bands has shown that they are the b1Σ+–X3Σ− bands of the NF molecule. The constants of the two states have been determined and it is found that for the ground state, ωe = 1 141.37 cm−1 and re = 1.317 3 Å.

Apparatus for simultaneous measurements of the polarization and spin-rotation parameters in high-energy elastic scattering on polarized protons

1975 ◽  
Vol 125 (4) ◽  
pp. 585-597 ◽  
Author(s):  
J.C. Raoul ◽  
P. Autones ◽  
R. Auzolle ◽  
C. Bruneton ◽  
J. Bystricky ◽  
...  
Keyword(s):  
Elastic Scattering ◽  
High Energy ◽  
Spin Rotation ◽  
Simultaneous Measurements ◽  
Polarized Protons ◽  
Rotation Parameters
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