Rotational perturbations and the Zeeman effect in the band of HCF

1984 ◽  
Vol 62 (12) ◽  
pp. 1328-1335 ◽  
Author(s):  
Tetsuo Suzuki ◽  
Shuji Saito ◽  
Eizi Hirota
Keyword(s):  
Laser Excitation ◽  
Zeeman Effect ◽  
Rotational Analysis ◽  
Coriolis Coupling ◽  
Vibronic Band ◽  
Coupling Term ◽  
Molecular Constants ◽  
Coriolis Interaction ◽  
Frequency Shifts ◽  
Vibrational Levels

The dye laser excitation spectrum of the [Formula: see text] vibronic band of HCF was observed between 18 190 and 18 422 cm−1 with Doppler-limited resolution. The observed spectrum exhibits a number of anomalies. The perturbations observed for Ka = 1 levels are well explained by an electronic Coriolis interaction with highly excited vibrational levels of the ground electronic state. Other anomalies are difficult to analyze, because most of them are local without showing any systematic frequency shifts. Some of the perturbed lines are found to have large Zeeman effects; thus the perturbations are ascribed to interactions with the lowest triplet state. The rotational analysis of the observed spectrum leads to the following molecular constants for HCF in the Ã1A(010) state: ν0 = 18 298.6927(71), B + C = 2.26710(34), B − C = 0.074(15), and the electronic Coriolis coupling term [Formula: see text], all in cm−1 with standard errors in parentheses.

High-resolution laser-excitation spectrum of the A2Π ← X2Σ system of TiN: rotational analysis of the 0–0, 1–1, and 2–2 bands

1985 ◽  
Vol 63 (7) ◽  
pp. 997-1004 ◽  
Author(s):  
K. Brabaharan ◽  
J. A. Coxon ◽  
A. Brian Yamashita
Keyword(s):  
High Resolution ◽  
Least Squares ◽  
Excitation Spectrum ◽  
Laser Excitation ◽  
Rotational Analysis ◽  
Molecular Constants ◽  
Individual Bands ◽  
Measured Line ◽  
Line Positions ◽  
Π State

The 0–0, 1–1, and 2–2 bands of the A2Π ← X2Σ system of TiN have been recorded using the technique of laser-excitation spectroscopy. Molecular constants have been obtained from direct least squares fits of the measured line positions of individual bands. The fitted constants confirm and extend previous determinations; for the A2Π state, some of the constants show unusually large variations with ν, in accord with the already known perturbation of this state in the ν = 0 level.

Vibration-rotation bands of trideuteromethyl iodide

1965 ◽  
Vol 288 (1412) ◽  
pp. 39-49 ◽  
Keyword(s):  
Fine Structure ◽  
Coupling Constants ◽  
Coriolis Coupling ◽  
Molecular Constants ◽  
Rotational Constants ◽  
Vibrational Levels ◽  
Theoretical Predictions ◽  
Vibration Rotation ◽  
Combination Bands

The rotational fine structure of six parallel and nine perpendicular vibration bands of tri­deuteromethyl iodide has been analysed, and molecular constants have been derived. These include the band origins, the rotational constants in different vibrational levels, the α A i and α B i values, and the Coriolis coupling constants ς i for the fundamental degenerate vibrations. The ς values for overtone and combination bands have been compared with values calculated from the ς i values of the fundamentals, and agree closely with previous theoretical predictions.

Measurement and analysis of the ν2 and ν4 infrared bands of CD4

1979 ◽  
Vol 57 (11) ◽  
pp. 1969-1981 ◽  
Author(s):  
W. A. Kreiner ◽  
A. G. Robiette
Keyword(s):  
Standard Deviation ◽  
Infrared Spectrum ◽  
Coriolis Coupling ◽  
Coupling Term ◽  
Molecular Constants ◽  
Measurement And Analysis

The infrared spectrum of CD4 has been recorded between 942 and 1201 cm−1, encompassing the ν2 and ν4 bands. The data have been analysed taking account of the Bζ24 Coriolis coupling term linking the upper states of the two bands. Six hundred seventy-five assigned transitions, reaching a maximum upper state J value of 20 in each band, have been fitted with a standard deviation of 0.013 cm−1 and new values of the molecular constants are reported.

Vibration-rotation bands and molecular constants of carbonyl sulphide

1954 ◽  
Vol 222 (1151) ◽  
pp. 431-443 ◽  
Keyword(s):  
Fermi Resonance ◽  
Resolving Power ◽  
Molecular Constants ◽  
Absorption Bands ◽  
Coriolis Interaction ◽  
Rotational Constants ◽  
Vibrational Levels ◽  
Vibration Rotation ◽  
Carbonyl Sulphide ◽  
First Time

The vibrational absorption bands of carbonyl sulphide 12 C 16 O 33 S near 5 μ have been examined using very high resolving power. Rotational fine structure has been resolved for the first time; six bands have been studied, including two associated with the isotopic species 13 C 16 O 33 S, and a rotational analysis of each has been carried out. Values have been derived for the rotational constants B and D in the different vibrational levels, and these have been compared with the results obtained from the microwave spectrum for the lower states. It has been found that the location of certain bands, and the rotational constants B are affected by Fermi resonance and Coriolis interaction, and estimates of the unperturbed values have been made.

Rotational Analysis of Bands of the Transition of PH2

1972 ◽  
Vol 50 (19) ◽  
pp. 2265-2276 ◽  
Author(s):  
J. M. Berthou ◽  
B. Pascat ◽  
H. Guenebaut ◽  
D. A. Ramsay
Keyword(s):  
Excited State ◽  
Ground State ◽  
Electronic Transition ◽  
Rotational Analysis ◽  
Empirical Formulas ◽  
Molecular Constants ◽  
Vibrational Levels

Rotational analyses have been carried out for the 0ν′20–000 bands of the [Formula: see text] electronic transition of PH2 with ν′2 = 1–8. Approximately 1000 lines have been assigned. The earlier analysis of the 000–000 band has been extended and improved molecular constants obtained. The Hamiltonian used for this band does not fit the excited state levels with [Formula: see text]. Term values are therefore given for all observed levels. Empirical formulas are presented which give approximate fits to the higher levels. Numerous rotational perturbations are found in the excited state. Perturbations up to 0.6 cm−1 are also found in the 000 level of the excited state. These latter perturbations can only be caused by the higher vibrational levels of the ground state.

The electronic spectrum of the CS+ molecular ion: rotational analysis and perturbation effects in the A2Πi–X2Σ+ transition

1978 ◽  
Vol 56 (5) ◽  
pp. 587-600 ◽  
Author(s):  
D. Gauyacq ◽  
M. Horani
Keyword(s):  
Carbon Disulfide ◽  
Ground State ◽  
Valence Electron ◽  
Band System ◽  
Local Perturbation ◽  
Rotational Analysis ◽  
Molecular Constants ◽  
Molecular Ion ◽  
Vibrational Levels ◽  
The Difference

A new emission spectrum in the red region (6000–8000 Å) has been recorded from a low pressure hot cathode discharge through carbon disulfide. This band system has been assigned to the A2Πi–X2Σ+ transition of the CS+ molecular ion on the basis of the rotational analysis and comparison with other nine valence-electron molecules. Molecular constants have been obtained by direct least squares fits of the line frequencies to the difference of the eigenvalues of standard 2Π and 2Σ+ matrices.A local perturbation in the A2Πi (ν = 5) state has been studied quantitatively. The position of the perturbing vibrational level in the X2Σ+ state has been determined within a few centimetre−1. This study gave a consistent set of molecular constants for the ground state of CS+ and allowed a partial deperturbation treatment of the observed vibrational levels of the excited A2Πi state.Numerous bands are also observed in the 4000 Å region. A discussion is given concerning the possible assignment of bands at 4059 and 4110 Å to the CS+B2Σ+–A2Πi (0,0) transition.

The Ã1 A2 – 1 A1 system of formaldehyde, H2C=0: Reanalysis of the 110410 and 510 bands

2001 ◽  
Vol 79 (2-3) ◽  
pp. 375-387 ◽  
Author(s):  
T Weber ◽  
S Bangs ◽  
W Hüttner ◽  
D A Ramsay
Keyword(s):  
Fourier Transform ◽  
Dye Laser ◽  
Fourier Transform Spectrometer ◽  
Rotational Analysis ◽  
Complete Coverage ◽  
Molecular Constants ◽  
Coriolis Interaction ◽  
Wave Numbers

A frequency-doubled dye laser was used to excite the fluorescence of formaldehyde in the region 31 099–31 185 cm–1. Using iodine standard lines, the wave numbers of nearly 300 lines of formaldehyde have been determined. Since these lines form only part of the overlapping 110410 and 510 bands of the Ã1A2– [Formula: see text]1A1 system, complete coverage of these bands was obtained using a Fourier-transform spectrometer. Some of the frequency-doubled lines were used as standards. Rotational analysis has been carried out and improved molecular constants obtained. The two bands show a Coriolis interaction. However, while earlier workers found an interaction proportional to Ka, we obtain a cubic dependence on this quantum number.PACS Nos.: 32.30Jc, 33.20Vq

IMPORTANCE OF CORIOLIS INTERACTION IN DEFORMED PROTON EMITTERS

2006 ◽  
Vol 15 (08) ◽  
pp. 1789-1795 ◽  
Author(s):  
M. COSTA LOPES ◽  
L. S. FERREIRA ◽  
E. MAGLIONE
Keyword(s):  
Drip Line ◽  
Proton Emission ◽  
Spin Orbit ◽  
Coriolis Coupling ◽  
Coupling Term ◽  
Coriolis Interaction ◽  
Deformed Nuclei ◽  
Adiabatic Approach ◽  
Spin Orbit Interactions ◽  
Good Agreement

The decay by proton emission of deformed nuclei is discussed. The Coriolis coupling term is included in the non-adiabatic approach and calculations with non-spherical spin-orbit interactions are performed. Within this model, the half-lives of deformed drip-line odd-even nuclei are shown to be in good agreement with experimental data.

Rotational Analysis of the A–X System of the SiCl Molecule

1971 ◽  
Vol 49 (4) ◽  
pp. 407-411 ◽  
Author(s):  
S. R. Singhal ◽  
R. D. Verma
Keyword(s):  
Ground State ◽  
Electronic States ◽  
Rotational Structure ◽  
Spin Coupling ◽  
Quartz Tube ◽  
Rotational Analysis ◽  
Coupling Constant ◽  
Spin Coupling Constant ◽  
Molecular Constants ◽  
Vibrational Levels

The A–X system of the SiCl molecule in the region 4500–6400 Å has been excited by an r.f. discharge through a mixture of argon and a trace of SiCl4 vapor, flowing through a quartz tube. Several red degraded and double headed bands with ν′ = 0, 1, 2, and 3 have been observed and the rotational structure of the 0-5, 0-6, 0-7, 0-8, 0-9, 0-10, 1-9, and 1-10 bands has been analyzed. The analysis shows that the bands arise from a 2Σ–2Π transition, 2Π being the ground state of the molecule. The molecular constants have been determined for both the electronic states. The spin coupling constant, Aν, of the X2Π vibrational levels has been found to follow an equation[Formula: see text]

Spectre d'émission de la molécule PO: Transitions C′2Δ–X2Πr et C2Σ−–X2Πr de P16O et P18O

1973 ◽  
Vol 51 (23) ◽  
pp. 2464-2473 ◽  
Author(s):  
J. C. Prudhomme ◽  
M. Larzillière ◽  
C. Couet
Keyword(s):  
Fine Structure ◽  
Vibrational Level ◽  
Rotational Analysis ◽  
Molecular Constants ◽  
Vibrational Levels ◽  
State 1

The rotational analysis of 11 bands of the C′–X2Πr system is carried out and has allowed the study of vibrational levels of the C′ state: 1, 2, 3, 4 for P16O and 0, 2, 3, 4 for P18O. The nature of the C′ state is confirmed as a 2Δ state. New molecular constants are proposed.The analysis of the fine structure of 4 bands of the C2Σ−–X2Πr transition of P18O shows that the lowest vibrational level of the C state, which has been characterized previously for P16O, is the level ν = 1. The molecular constants of this state have been modified on account of the new identification.The fine doubling of the X2Π, C′2Δ, and C2Σ− are discussed.

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