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.

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.

Array design

1968 ◽  
Vol 58 (3) ◽  
pp. 977-991
Author(s):  
Richard A. Haubrich
Keyword(s):  
High Resolution ◽  
Data Processing ◽  
Least Square ◽  
Wave Number ◽  
Array Design ◽  
Least Square Fit ◽  
The Difference ◽  
Set Of Points ◽  
Array Output

abstract Arrays of detectors placed at discrete points are often used in problems requiring high resolution in wave number for a limited number of detectors. The resolution performance of an array depends on the positions of detectors as well as the data processing of the array output. The performance can be expressed in terms of the “spectrum window”. Spectrum windows may be designed by a general least-square fit procedure. An alternate approach is to design the array to obtain the largest uniformly spaced coarray, the set of points which includes all the difference spacings of the array. Some designs obtained from the two methods are given and compared.

Mikrowellenspektrum von 12C34SF37Cl

1976 ◽  
Vol 31 (6) ◽  
pp. 594-601 ◽  
Author(s):  
R. Hamm ◽  
H. J. Kohrmann ◽  
H. Günther ◽  
W. Zeil
Keyword(s):  
Equilibrium Structure ◽  
Microwave Spectrum ◽  
Natural Abundance ◽  
Least Square ◽  
Centrifugal Distortion ◽  
Rotational Constants ◽  
Isotopic Species ◽  
Planar Molecule ◽  
Least Square Fit ◽  
Centrifugal Distortion Constants

The microwave spectrum of the isotopic species 12C34SF37Cl has been measured in natural abundance. The three rotational constants and five quartic centrifugal distortion constants have been determined by a least square fit. In comparison with our former calculations, the five structural r0-parameters of the planar molecule have now been determined from eight rotational constants instead of six, thus yielding remarkably smaller confidence intervalls. Furthermore an re-structure has been calculated and an equilibrium-structure has been estimated

C2Πr – X2Σ+ transition of AlO

1983 ◽  
Vol 61 (9) ◽  
pp. 1347-1358 ◽  
Author(s):  
M. Singh ◽  
M. D. Saksena
Keyword(s):  
High Resolution ◽  
Rotational Structure ◽  
Rotational Constants ◽  
First Time ◽  
Π State

Several bands of the C2Πr – X2Σ+transition of AlO in the region 2800–3400 Å have been photographed at high resolution. A unique and unambiguous analysis of the rotational structure has been done for the first time for the 2–0, 1–0, 2–1, 0–0, 1–1, 0–1, 1–2, and 0–2 bands of this system. Fairly accurate rotational constants Beff and Deff have been determined for the ν = 2, 1, and 0 levels of the C2Πr state. Severe rotational perturbations have been observed in the C2Π, state.Equilibrium rotational constants (in cm−1) of the C2Π, state are Be ≈ 0.6049 and αe ≈ 0.0046.

scholarly journals Колебательно-вращательный спектр высокого разрешения в районе полос 3ν-=SUB=-4-=/SUB=-, ν-=SUB=-2-=/SUB=-+2ν-=SUB=-4-=/SUB=- и 2ν-=SUB=-2-=/SUB=-+ν-=SUB=-4-=/SUB=- молекулы -=SUP=-72-=/SUP=-GeH-=SUB=-4-=/SUB=-

2022 ◽  
Vol 130 (3) ◽  
pp. 345
Author(s):  
А.В. Кузнецов ◽  
Н.И. Распопова ◽  
О.В. Громова ◽  
Е.С. Бехтерева ◽  
М.А. Кошелев ◽  
...  
Keyword(s):  
High Resolution ◽  
Quantum Number ◽  
Optical Resolution ◽  
Rotational Structure ◽  
High Resolution Spectrum ◽  
Effective Hamiltonian ◽  
Rotational Bands ◽  
Fitting Procedure ◽  
Maximum Value ◽  
Line Positions

The high-resolution spectrum of the 72GeH4 molecule was recorded on a Bruker IFS 125HR Fourier spectrometer with an optical resolution of 0.003 cm-1. The line positions were analyzed for ten interacting vibrational-rotational bands 3ν4 (1F2, F1, 2F2), v2+ 2ν4 (1E, F1, F2, 2E) and 2ν2+v4 (1F2, F1, 2F2) in the range 2350-2750 cm-1. As a result of the analysis, 1726 experimental lines were identified with the maximum value of the quantum number Jmax = 17; then used in the fitting procedure with parameters of the effective Hamiltonian. The resulting set of 35 spectroscopic parameters describes the vibrational-rotational structure of the spectrum with drms = 7.5 · 10-4 cm-1.

Analysis of the high resolution spectrum of the ν2 and ν5 absorption bands of methyl chloride

1984 ◽  
Vol 62 (3) ◽  
pp. 247-253 ◽  
Author(s):  
M. Morillon-Chapey ◽  
G. Guelachvili ◽  
Per Jensen
Keyword(s):  
Standard Deviation ◽  
High Resolution ◽  
Infrared Spectrum ◽  
Least Squares ◽  
Methyl Chloride ◽  
High Resolution Spectrum ◽  
Vibrational States ◽  
Absorption Bands ◽  
Least Squares Fit

The infrared spectrum of methyl chloride CH3Cl between 1280 and 1650 cm−1 has been recorded at high resolution (0.005 cm−1). The Coriolis interactions between ν2(A1) and ν5(E) and between 2ν3(A1) and ν5 have been investigated through a least squares fit to the transitions observed for CH335Cl. Ten parameters for the three upper vibrational states and three interaction constants have been determined, reproducing the 1200 observed wavenumbers with a standard deviation of 0.002 cm−1. An accidental resonance of the type l(ΔK = 2, Δl = −1) between ν2 and ν5 was found to be present in the spectrum.

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.

The ν5 Fundamental Bands of N2H2 and N2D2

1974 ◽  
Vol 52 (4) ◽  
pp. 340-344 ◽  
Author(s):  
M. Carlotti ◽  
J. W. C. Johns ◽  
A. Trombetti
Keyword(s):  
Absorption Spectrum ◽  
Infrared Absorption ◽  
Ground State ◽  
Infrared Absorption Spectrum ◽  
Geometrical Parameters ◽  
Centrifugal Distortion ◽  
Trans Conformation ◽  
Complete Set ◽  
Centrifugal Distortion Constants ◽  
First Time

The infrared absorption spectrum of diimide (N2H2) in the 3.2 μm region has been reexamined at higher resolution than previously, and that of dideuterodiimide (N2D2) at 4.3 μm has been recorded for the first time. The ν5 fundamental (A- and B-type hybrid band) for both isotopic molecules has been analyzed, and a complete set of rotational and centrifugal distortion constants for the ground and ν5 = 1 states have been determined. The rotational constants of the ground states are (cm−1) [Formula: see text] and the following geometrical parameters were obtained for the planar trans-conformation of diimide : [Formula: see text] From the intensity alternation observed in the J structure of N2H2 spectrum, it is concluded that diimide has a totally symmetric ground state.

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.

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