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

Low-lying electronic states of CuBr

2001 ◽  
Vol 79 (2-3) ◽  
pp. 299-343 ◽  
Author(s):  
T Hirao ◽  
P F Bernath
Keyword(s):  
Fourier Transform ◽  
Electronic States ◽  
Buffer Gas ◽  
Fourier Transform Spectrometer ◽  
Molecular Constants ◽  
Expansion Formula ◽  
Condon Factors ◽  
Mass Dependent ◽  
Franck Condon ◽  
Potential Curves

The A1Π – X1Σ+ and B1Σ+ – X1Σ+ transitions of copper monobromide, CuBr, were recorded with a Fourier transform spectrometer. The emission was generated by using a hollow cathode discharge of Ar buffer gas and a mixture of Cu and CuBr powders. The mass-dependent Dunham expansion formula was used to obtain improved molecular constants for the ground, A and B states. These molecular constants provided RKR potential curves and Franck–Condon factors for the A–X and B–X transitions.PACS No. 35.80 transitions. PACS No. 35.80

High-Resolution Infrared Spectrum of Diazirine, H2CN2. Rovibrational Analysis of the Methylene Deformation Band

1988 ◽  
Vol 43 (4) ◽  
pp. 331-337 ◽  
Author(s):  
A. Gambi ◽  
A. Baldacci ◽  
S. Giorgianni
Keyword(s):  
Fourier Transform ◽  
High Resolution ◽  
Infrared Spectrum ◽  
Least Squares ◽  
Deformation Band ◽  
Fourier Transform Spectrometer ◽  
Centrifugal Distortion ◽  
Molecular Constants ◽  
Centrifugal Distortion Constants

Abstract The infrared spectrum of diazirine has been recorded at Doppler resolution with a high informa­tion Fourier transform spectrometer. The ν3 fundamental has been reinvestigated and the overall assignment of the rovibrational transitions has been carried out. From the least-squares analysis a more accurate set of molecular constants including the sextic centrifugal distortion constants has been determined for the level υ3 = 1 and will be reported here. The higher resolution achieved here allowed the assignment of weaker lines and many Q branch transitions. Moreover many blended lines have now been resolved and could be properly assigned.

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.

scholarly journals Franck – Condon Factors And r- Centroids of D – A and D – B band systems of AlO molecule

2020 ◽  
Vol 66 (5 Sept-Oct) ◽  
pp. 568
Author(s):  
C. T. Londhe ◽  
Hewa Y Abdullah
Keyword(s):  
Fourier Transform ◽  
Excited State ◽  
Aluminium Oxide ◽  
Fourier Transform Spectrometer ◽  
Molecular Constants ◽  
Condon Factors ◽  
Franck Condon ◽  
Alo Molecule

Franck–Condon factors and r-centroids were computed for the D2S+ - A2Πi and D2S+ - B2S+ band systems of the aluminium oxide (AlO) molecule for the v' = 10; v" = 10 matrix using the method developed by Jarmain and Nicholls. The latest Fourier-transform Spectrometer molecular constants of ground and excited state are used. The intensities of these bands are discussed and the Franck–Condon factors and r-centroids obey the established relationships

Fourier transform infrared spectroscopy of the BH3 ν2 band

1994 ◽  
Vol 72 (11-12) ◽  
pp. 925-929 ◽  
Author(s):  
K. Kawaguchi
Keyword(s):  
Fourier Transform ◽  
Infrared Spectroscopy ◽  
Standard Deviation ◽  
Diode Laser ◽  
Fourier Transform Infrared ◽  
Interaction Constant ◽  
Molecular Constants ◽  
Coriolis Interaction ◽  
Laser Spectrum ◽  
Infrared Spectrometer

The spectrum of the BH3 ν2 band was observed in the 900–1300 cm−1 region with a Fourier transform infrared spectrometer. The borane molecule was produced with a discharge in a B2H6 and He mixture. The observed spectrum was analyzed by including the Coriolis interaction from the ν4 state to determine the molecular constants in the ν2 and ν4 states. The band origins and the Coriolis interaction constant were determined to be ν2 = 1147.4986 (12), ν4 = 1196.66 (12), and D24 = 7.8034 (48) cm−1, with one standard deviation in parentheses. The previous Q-branch assignment of the diode laser spectrum was partly revised.

Infrared spectrum and molecular constants of CO2 in the 1.4–1.7 μm atmospheric window by very high resolution Fourier transform spectroscopy

1980 ◽  
Vol 58 (11) ◽  
pp. 1560-1569 ◽  
Author(s):  
J. P. Maillard ◽  
M. Cuisenier ◽  
Ph. Arcas ◽  
E. Arié ◽  
C. Amiot
Keyword(s):  
Fourier Transform ◽  
High Resolution ◽  
Infrared Spectrum ◽  
Accurate Determination ◽  
Spectroscopic Constants ◽  
Fourier Transform Spectrometer ◽  
Molecular Constants ◽  
Atmospheric Window ◽  
Very High

The spectrum of CO2 has been recorded in the 1.4–1.7 μm atmospheric window using the very high resolution Fourier transform spectrometer of the Meudon Observatory. This laboratory study has allowed the accurate determination of the spectroscopic constants previously evaluated from the Venus spectrum.

Molecular beam millimeter sidebands Fourier transform spectrometer (MB-MMSBFT)

1994 ◽  
Vol 15 (9) ◽  
pp. 1481-1496 ◽  
Author(s):  
D. Boucher ◽  
R. Bocquet ◽  
D. Petitprez ◽  
L. Aime
Keyword(s):  
Fourier Transform ◽  
Molecular Beam ◽  
Fourier Transform Spectrometer
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