Dipole matrix elements for vibration–rotation lines in the fundamental band of the hydrogen bromide molecule

1970 ◽  
Vol 48 (3) ◽  
pp. 330-334 ◽  
Author(s):  
Bruce P. Gustafson ◽  
B. Sesh Rao
Keyword(s):  
High Resolution ◽  
Hydrogen Bromide ◽  
Spectral Lines ◽  
Matrix Elements ◽  
Fundamental Vibration ◽  
Double Pass ◽  
Fundamental Band ◽  
Growth Method ◽  
Vibration Rotation ◽  
First Time

The equivalent widths of 16 lines in the fundamental vibration–rotation band of the H79Br molecule are measured in the linear region of the curve-of-growth method. The measurements are made on a Littrow type high-resolution infrared grating spectrometer in a double-pass manner so that the two isotopic lines of H79Br and H81Br, which are separated by approximately 0.4 cm−1, could be completely resolved. From the measurements of equivalent widths, the strengths and squares of the dipole matrix elements for the spectral lines are calculated. This is the first time the high-resolution work on the fundamental band has ever been presented. The present high-resolution values are found to be approximately one-half of the values of an earlier low-resolution work.

Dipole matrix elements for vibration–rotation lines in the 2–0 band of the hydrogen bromide molecule

1968 ◽  
Vol 46 (24) ◽  
pp. 2739-2743 ◽  
Author(s):  
B. Sesh Rao ◽  
LuVerne H. Lindquist
Keyword(s):  
High Resolution ◽  
Hydrogen Bromide ◽  
Matrix Elements ◽  
Low Resolution ◽  
Rotation Band ◽  
Grating Spectrometer ◽  
Vibration Rotation ◽  
First Time ◽  
Resolution Spectrometer ◽  
Line Strengths

The equivalent widths, the line strengths, and the squares of the dipole matrix elements of the 2–0 vibration–rotation band lines of the H79Br molecule are measured. The measurements are made on a high-resolution infrared grating spectrometer which could completely resolve the two isotopic lines of H79Br and H81Br. This is the first time the high-resolution work on the intensities of the HBr molecule has ever been presented. The present data are compared with the earlier work obtained using a low-resolution spectrometer. It is found that the present values are considerably less than the earlier low-resolution values. The discrepancy between the two sets of results is attributed to the lack of resolution in the earlier investigations.

Infrared spectrum of the fundamental ν1 of deutero-isocyanic acid

1981 ◽  
Vol 59 (10) ◽  
pp. 1313-1326 ◽  
Author(s):  
D. A. Steiner ◽  
S. R. Polo ◽  
T. K. McCubbin Jr. ◽  
K. A. Wishah
Keyword(s):  
High Resolution ◽  
Infrared Spectrum ◽  
Isocyanic Acid ◽  
Centrifugal Distortion ◽  
Rotational Constants ◽  
Fundamental Band ◽  
Band Origin ◽  
Stretching Vibration ◽  
Centrifugal Distortion Constants ◽  
First Time

The ν1 fundamental band of DNCO has been observed for the first time under high resolution. The band origin for this deuterium–nitrogen stretching vibration is found to be at 2637.198 cm−1, rather distant from the previously reported value of 2634.9 cm−1. Eighteen subbands have been analyzed and term values for both ground and ν1 states with K up to 6 have been obtained. Effective rotational constants Bν and centrifugal distortion constants Dν and Hν have also been determined. Interaction is observed with the 2ν3 vibration which has a band origin around 2640 cm−1. Interesting perturbations are observed for the K = 0 and K = 4 levels of ν1.

Direct measurements of N2 broadened linewidths in the CO fundamental at low temperatures

1983 ◽  
Vol 61 (2) ◽  
pp. 192-197 ◽  
Author(s):  
J.-P. Bouanich ◽  
R. Farrenq ◽  
C. Brodbeck
Keyword(s):  
High Resolution ◽  
Temperature Dependence ◽  
Low Temperatures ◽  
Variable Temperature ◽  
Absorption Cell ◽  
Fundamental Band ◽  
Direct Measurements ◽  
High Resolution Spectrometer ◽  
Vibration Rotation ◽  
Resolution Spectrometer

The halfwidths of CO vibration–rotation lines, pressure-broadened by N2 have been measured in the fundamental band at −83, −148, and −180 °C, using a variable temperature absorption cell and a high resolution spectrometer. The temperature dependence of linewidths has been calculated from the Anderson–Tsao–Curnutte theory and compared to the experimental determinations.

Improved Molecular Constants of Acetylene Obtained from the v5 Band System

1990 ◽  
Vol 45 (8) ◽  
pp. 946-952 ◽  
Author(s):  
A. Moravec ◽  
G. Winnewisser ◽  
K. M. T. Yamada ◽  
C. E. Blom
Keyword(s):  
High Resolution ◽  
Band System ◽  
Natural Abundance ◽  
Molecular Constants ◽  
Bending Vibration ◽  
Fundamental Band ◽  
Rotation Band ◽  
Isotopic Species ◽  
Hot Band ◽  
Vibration Rotation

Abstract A vibration-rotation band system of acetylene of the /Πu bending vibration v5 has been recorded with high resolution by a Bruker IFS 120 HR Michelson spectrometer. From the analysis of the hot band of the normal isotopic species, v4 + v5 - v4, and the fundamental band of HC13CH in natural abundance an improved set of constants has been derived. The intensity perturbation due to the l-type resonance has been clearly observed in the band system v4 + v5 -v4

scholarly journals Spectroscopic and Piezospectroscopic Studies of the Energy States of Boron in Silicon

1994 ◽  
Vol 47 (3) ◽  
pp. 329 ◽  
Author(s):  
RA Lewis ◽  
P Fisher ◽  
NA McLean
Keyword(s):  
High Resolution ◽  
Accurate Determination ◽  
Binding Energies ◽  
Spectral Lines ◽  
Oscillator Strengths ◽  
Recent Theory ◽  
Deformation Potential ◽  
Transition Energies ◽  
Experimental Values ◽  
First Time

The P3/2 optical absorption spectrum of boron impurity in silicon has been re-examined at high resolution. The precise transition energies measured agree with energies previously reported. In addition, energies for several previously unrecognised transitions are given as well as values for the absorption strengths and line widths. The measured transition energies and absorption strengths correlate very well with several recent calculations of binding energies and oscillator strengths, respectively. This excellent agreement between experiment and theory motivates a renumbering of the spectral lines which is not expected to require future modification. High-resolution piezospectroscopy of the P3/2 series has also been undertaken. Small stresses were used to minimise the effect of interactions and permit accurate determination of the deformation potential constants. The deformation potential constants are found to be in fair agreement with previous experimental values and good agreement with recent theory. Experimental values for several of these are given for the first time, as are isotropic deformation potential constants of several excited states relative to the ground state.

scholarly journals 3-D hydrodynamic simulations of convection in A stars

2006 ◽  
Vol 2 (S239) ◽  
pp. 68-70 ◽  
Author(s):  
O. Kochukhov ◽  
B. Freytag ◽  
N. Piskunov ◽  
M. Steffen
Keyword(s):  
High Resolution ◽  
High Amplitude ◽  
Spectral Lines ◽  
Hydrodynamic Models ◽  
Hydrodynamic Simulations ◽  
Ongoing Effort ◽  
Theoretical Predictions ◽  
Spectrum Synthesis ◽  
Convective Motions ◽  
First Time

AbstractBroadening and asymmetry of spectral lines in slowly rotating late A-type stars provide evidence for high-amplitude convective motions. The properties of turbulence observed in the A-star atmospheres are not understood theoretically and contradict results of previous numerical simulations of convection. Here we describe an ongoing effort to understand the puzzling convection signatures of A stars with the help of 3-D hydrodynamic simulations. Our approach combines realistic spectrum synthesis and non-grey hydrodynamic models computed with the CO5BOLD code. We discuss these theoretical predictions and confront them with high-resolution spectra of A stars. Our models have, for the first time, succeeded in reproducing the observed profiles of weak spectral lines without introducing fudge broadening parameters.

The high-resolution infrared spectrum of cyanobutadiyne, HC5N: The ν7 band centered at 642 cm

1994 ◽  
Vol 72 (11-12) ◽  
pp. 1165-1178 ◽  
Author(s):  
Sybille Haas ◽  
Gisbert Winnewisser ◽  
Koichi M.T. Yamada
Keyword(s):  
High Resolution ◽  
Infrared Spectrum ◽  
Ftir Spectroscopy ◽  
Electric Discharge ◽  
Infrared Band ◽  
Millimetre Wave ◽  
Fundamental Band ◽  
Molecular Parameters ◽  
Wave Data ◽  
First Time

The ν7 infrared band of cyanobutadiyne (HC5N) was recorded for the first time with high resolution by FTIR spectroscopy using a sample produced by gas electric discharge. The fundamental band and the hot bands arising from the ν11 = and 2 states are identified. The molecular parameters, including the rotational and vibrational ℓ-type doubling constants, have been determined accurately by analyzing the spectra together with the available microwave and millimetre wave data. The intensity perturbation caused by the ℓ-type resonance in the (ν7,ν11) = (1,1) state has been clearly observed and discussed.

Ground state molecular parameters of phosphine, PH3, from the simultaneous analysis of the high-resolution infrared, microwave and submillimeterwave spectra

1985 ◽  
Vol 50 (11) ◽  
pp. 2480-2492 ◽  
Author(s):  
Soňa Přádná ◽  
Dušan Papoušek ◽  
Jyrki Kauppinen ◽  
Sergei P. Belov ◽  
Andrei F. Krupnov ◽  
...  
Keyword(s):  
Fourier Transform ◽  
High Resolution ◽  
Ground State ◽  
Unitary Transformation ◽  
Point Of View ◽  
Acoustic Detection ◽  
Molecular Parameters ◽  
Microwave Spectrometer ◽  
Fourier Transform Spectra ◽  
First Time

Fourier transform spectra of the ν2 band of PH3 have been remeasured with 0.0045 cm-1 resolution. Ground state combination differences from these data have been fitted simultaneously with the microwave and submillimeterwave data to determine the ground state spectroscopical parameters of PH3 including the parameters of the Δk = ± 3n interactions. The correlation between the latter parameters has been discussed from the point of view of the existence of two equivalent effective rotational operators which are related by a unitary transformation. The ΔJ = 0, +1, ΔK = 0 (A1 ↔ A2, E ↔ E) rotational transitions in the ν2 and ν4 states have been measured for the first time by using a microwave spectrometer and a radiofrequency spectrometer with acoustic detection.

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