High resolution study of the absorption spectrum of the first positive system of N2

1984 ◽  
Vol 62 (4) ◽  
pp. 414-418 ◽  
Author(s):  
R. D. Verma
Keyword(s):  
Absorption Spectrum ◽  
High Resolution ◽  
High Resolution Spectrum ◽  
Positive System ◽  
Rotational Analysis ◽  
First Time ◽  
Resolution Study

The first positive system of N2, B3Πg – A3Σu+, has been obtained in absorption by the flash discharge technique. From a high resolution spectrum, a rotational analysis of the 12–8, 13–9, 14–10, 15–11, 13–8, and 14–9 bands has been carried out. Information on the B3Πg, ν = 13, 14, and 15, and A3Σu+, ν = 9, 10, and 11 levels is reported for the first time.

scholarly journals Спектр высокого разрешения полос ν-=SUB=-2-=/SUB=-+ν-=SUB=-4-=/SUB=- (F-=SUB=-1-=/SUB=-,F-=SUB=-2-=/SUB=-) и 2ν-=SUB=-4-=/SUB=- (F-=SUB=-2-=/SUB=-) дейтерированного силана -=SUP=-28-=/SUP=-SiD-=SUB=-4-=/SUB=-

2021 ◽  
Vol 129 (9) ◽  
pp. 1122
Author(s):  
А.В. Кузнецов ◽  
Н.И. Распопова ◽  
Е.С. Бехтерева ◽  
О.В. Громова
Keyword(s):  
Absorption Spectrum ◽  
High Resolution ◽  
Least Square ◽  
Rotational Structure ◽  
High Resolution Spectrum ◽  
Centrifugal Distortion ◽  
Vibrational States ◽  
Silane Molecule ◽  
Least Square Fit ◽  
First Time

A study of the fine rotational structure of the silane molecule absorption spectrum was carried out for the first time. The high-resolution spectrum of 28SiD4 was recorded in the 1260-1480 cm-1 spectral range the vibrational ν2+ν4 (F1,F2) and 2ν4 (F2) bands were theoretically analyzed. Rotational, centrifugal distortion, tetrahedral splitting and resonance interaction parameters of the upper vibrational states were obtained from the weighted least square fit method. The set parameters obtained reproduces the initial vibrational-rotational structure of the ν2 + ν4 (F1, F2) and 2ν4 (F2) bands with an accuracy of drms = 3.9 · 10-4 cm-1.

A high-resolution study of the absorption spectrum of PKS 2126-158

1979 ◽  
Vol 229 ◽  
pp. 891 ◽  
Author(s):  
P. J. Young ◽  
W. L. W. Sargent ◽  
A. Boksenberg ◽  
R. F. Carswell ◽  
J. A. J. Whelan
Keyword(s):  
Absorption Spectrum ◽  
High Resolution ◽  
Resolution Study

10μm High-resolution spectrum of trans-acrolein: Rotational analysis of the ν11, ν16, ν14 and ν16+ν18−ν18 bands

2011 ◽  
Vol 268 (1-2) ◽  
pp. 136-146 ◽  
Author(s):  
Li-Hong Xu ◽  
Xingjie Jiang ◽  
Hongyu Shi ◽  
R.M. Lees ◽  
A.R.W. McKellar ◽  
...  
Keyword(s):  
High Resolution ◽  
High Resolution Spectrum ◽  
Rotational Analysis

The absorption spectrum of C2H2 around ν1 + ν3: energy standards in the 1.5 μm region and vibrational clustering

1994 ◽  
Vol 72 (11-12) ◽  
pp. 1241-1250 ◽  
Author(s):  
Q. Kou ◽  
G. Guelachvili ◽  
M. Abbouti Temsamani ◽  
M. Herman
Keyword(s):  
Absorption Spectrum ◽  
Fourier Transform ◽  
High Resolution ◽  
Rotational Analysis ◽  
Vibrational Assignment ◽  
Calibration Standards ◽  
Vibrational Levels ◽  
Vibrational Transitions ◽  
The Fourier Transform ◽  
Anharmonic Couplings

We have recorded the Fourier transform absorption spectrum of acetylene, C2H2, at high resolution, around 6500 cm−1. The positions of the strongest rovibrational lines are measured with respect to the rovibrational lines in 3-0 of CO. They provide secondary calibration standards in that range with an accuracy of 3 × 10−4 cm−1. The rotational analysis of the data gives evidence of five vibrational levels of [Formula: see text] symmetry, in addition to the bright combination level (1010000). This is demonstrated to strictly fit the predicted anharmonic resonance pattern in that region, which permits the vibrational assignment of those extra transitions. Study of the relative intensities of the reported vibrational transitions suggests the need to include new quartic anharmonic couplings. This is supported by the rovibrational analysis of the cold bands around 8500 cm−1, involving the (1110000) bright level, which is also presented.

High-resolution studies of the Herzberg band system (C1Σ+ – A1Π]) in the 13C18O molecule

1988 ◽  
Vol 66 (11) ◽  
pp. 1012-1024 ◽  
Author(s):  
R. Kępa
Keyword(s):  
High Resolution ◽  
Band System ◽  
Rotational Analysis ◽  
Rotational Constants ◽  
Combined Analysis ◽  
Isotopic Molecule ◽  
Vibrational Constants ◽  
First Time ◽  
Π State

Seven bands ((0–0) – (0–6)) belonging to the Herzberg system of 13C18O have been recorded in emission using conventional photographic spectroscopy. For the first time, lines of this system have been recorded at high resolution and identified. After the rotational analysis of bands, the rotational constants of the C1Σ+ (ν = 0) and A1Π (ν = 0–6) states, as well as the vibrational constants of the A1Π state, have been determined. A combined analysis of the bands of the Herzberg and Ångström systems have made it possible to determine the constants of the B1Σ+ state more precisely. Numerous rotational perturbations observed in the A1Π state in this isotopic molecule have been analyzed.

scholarly journals Combined stellar evolution and spectroscopic modeling of massive stars

2015 ◽  
Vol 11 (A29B) ◽  
pp. 455-457
Author(s):  
Jose H. Groh
Keyword(s):  
High Resolution ◽  
Stellar Evolution ◽  
Massive Star ◽  
Massive Stars ◽  
Atmospheric Modeling ◽  
High Resolution Spectrum ◽  
Morphological Appearance ◽  
First Time

AbstractThe morphological appearance of massive stars during their evolution and at the pre-SN stage is very uncertain, both from theoretical and observational perspectives. We recently developed coupled stellar evolution and atmospheric modeling of stars done with the Geneva and CMFGEN codes, for initial masses between 9 and 120 M⊙. We are able to predict the observables such as the high-resolution spectrum and broadband photometry. Here I discuss how the spectrum of a massive star changes across its evolution and before death. Our models allow, for the first time, direct comparison between predictions from stellar evolution models and observations of SN progenitors.

First High-Resolution Study of the13CHD3Infrared Spectrum: Rotational Analysis of the Ground State and the Fundamentals ν5and ν3/ν6

1998 ◽  
Vol 191 (1) ◽  
pp. 9-16 ◽  
Author(s):  
O.N. Ulenikov ◽  
G.A. Onopenko ◽  
S. Alanko ◽  
M. Koivusaari ◽  
R. Anttila
Keyword(s):  
High Resolution ◽  
Ground State ◽  
Rotational Analysis ◽  
Resolution Study

New results on the D2Π and B′2Π states of the PO molecule

1976 ◽  
Vol 54 (6) ◽  
pp. 695-708 ◽  
Author(s):  
S. Ghosh ◽  
S. Nagaraj ◽  
R. D. Verma
Keyword(s):  
Absorption Spectrum ◽  
High Resolution ◽  
Vibrational Level ◽  
Rotational Analysis ◽  
X Band ◽  
Vibrational Levels ◽  
Π State

A rotational analysis of the D–X and D′–X band systems of PO in the region 1900–2100 Å has been reinvestigated from an absorption spectrum taken at high resolution. A new ν = 1 vibrational level of the D2Π state of PO interacting with a new vibrational level of the D′2Π state has been studied in detail. Two other new vibrational levels, ν = 2 and 3, of D2Π have been recorded and studied in detail. A rigorous deperturbation of the D and D′ levels has been carried out. It has been shown that D′2Π and B′2Π are one and the same state of the PO molecule. A new band overlapped by the D′–X, 26–0 band has been attributed to the B2Σ+–X2Π transition.

Rotational analysis of the B2Σ+ – A2Πi system of the 12C16O+ molecule

1987 ◽  
Vol 65 (1) ◽  
pp. 94-100 ◽  
Author(s):  
Z. Jakubek ◽  
R. Kepa ◽  
A. Para ◽  
M. Rytel
Keyword(s):  
High Resolution ◽  
Least Squares ◽  
Least Squares Method ◽  
Nonlinear Least Squares ◽  
Spin Rotation ◽  
Spin Orbit ◽  
Rotational Analysis ◽  
Molecular Constants ◽  
Nonlinear Least Squares Method ◽  
First Time

The three bands (0–0, 1–0, 0–1) of the B2Σ+ – A2Πi system of the 12C16O+ molecule have been photographed at high resolution. In total, 824 lines were measured, from which 608 were fitted by a nonlinear least squares method to determine 33 molecular constants. The band-by-band results were merged to obtain 23 molecular constants for the B2Σ+, ν = 0 and 1, and A2Πi, ν = 0 and 1, states. The Λ-doubling constants and spin-orbit constants in the A2Πi, ν = 1 state and spin-rotation constants in the B2Σ+, ν = 0 and 1 states were obtained for the first time, and other constants were defined more precisely.

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