Rotational spectrum of chloroform, “grass-roots among the forest of trees”: The v2=1, v3=2, v5=1, and v6=3 vibrational states of CH35Cl3

2021 ◽  
pp. 107937
Author(s):  
Adina Ceausu – Velcescu ◽  
Petr Pracna ◽  
Laurent Margules ◽  
Adriana Predoi-Cross
Keyword(s):  
Rotational Spectrum ◽  
Vibrational States ◽  
Grass Roots

The rotational spectrum of methyl cyanide-d3 analysis of the low-lying excited vibrational states

1991 ◽  
Vol 149 (1) ◽  
pp. 242-251 ◽  
Author(s):  
J. Cosleou ◽  
J.C. López ◽  
J.L. Alonso ◽  
G. Wlodarczak ◽  
J. Demaison
Keyword(s):  
Rotational Spectrum ◽  
Vibrational States ◽  
Methyl Cyanide

Das Rotationsspektrum des JF/ Rotational Spectrum of IF

1973 ◽  
Vol 28 (9) ◽  
pp. 1405-1407 ◽  
Author(s):  
E. Tiemann ◽  
J. Hoeft ◽  
T. Törring
Keyword(s):  
Hyperfine Structure ◽  
Microwave Discharge ◽  
Rotational Spectrum ◽  
Vibrational States ◽  
Rotational Transitions

IF was produced by microwave discharge of l2 and C6F10(CFa)2. The rotational transitions J=0→1 and 1→2 in the vibrational states ν = 0, 1, 2 were observed. The analysis of the hyperfine structure yields the following hfs constants:127I: e qv Q = (-3440.89+5.47 (ν+½) ±0.20) MHz,cI = ( + 90 ±10) kHz.

Microwave Rotational Spectrum of Indium Monofluoride

1969 ◽  
Vol 24 (4) ◽  
pp. 634-636 ◽  
Author(s):  
F. J. Lovas ◽  
T. Törring
Keyword(s):  
Spin Rotation ◽  
Coupling Constants ◽  
Rotational Spectrum ◽  
Coupling Constant ◽  
Vibrational States ◽  
Molecular Parameters ◽  
Microwave Rotational Spectrum ◽  
Quadrupole Coupling ◽  
Rotational Transitions

Abstract The rotational transitions J = 1 → 2 and 2 → 3 were measured in 115In19F. From these spectra the following molecular parameters have been determined: the Dunham-coefficients Y01, Y11 and Y02, the quadrupole coupling constants, eqQ, in the ν = 0 and v = 1 vibrational states as well as the spin-rotation coupling constant cIn.

Millimeter and submillimeter wave rotational spectrum of pyridine in the ground and excited vibrational states

2005 ◽  
Vol 232 (1) ◽  
pp. 61-65 ◽  
Author(s):  
Enyi Ye ◽  
Ryan P.A. Bettens ◽  
Frank C. De Lucia ◽  
Douglas T. Petkie ◽  
Sieghard Albert
Keyword(s):  
Submillimeter Wave ◽  
Rotational Spectrum ◽  
Vibrational States

scholarly journals Accurate rest frequencies for propargylamine in the ground and low-lying vibrational states

2018 ◽  
Vol 615 ◽  
pp. A176 ◽  
Author(s):  
C. Degli Esposti ◽  
L. Dore ◽  
C. Puzzarini ◽  
M. Biczysko ◽  
J. Bloino ◽  
...  
Keyword(s):  
Interstellar Medium ◽  
Organic Molecules ◽  
Coupling Constants ◽  
Spectroscopic Constants ◽  
Rotational Spectrum ◽  
Centrifugal Distortion ◽  
Vibrational States ◽  
Important Species ◽  
Centrifugal Distortion Constants ◽  
High Level

Context. To date, several complex organic molecules have been detected in the interstellar medium, and they have been suggested as precursors of biologically important species. Propargylamine (HC ≡C−CH2−NH2) is structurally similar to a number of other organic molecules which have already been identified by radioastronomy, making it a good candidate for astrophysical detection. Aims. This work provides accurate rest frequencies of propargylamine, from the centimeter-wave to the submillimeter-wave region, useful to facilitate the detection of this molecule in the interstellar medium. Methods. An extensive laboratory study of the rotational spectrum of propargylamine has been performed using a pulsed-jet Fourier Transform Microwave (FTMW) spectrometer (7–19 GHz frequency range) and a frequency modulation microwave spectrometer (75–560 GHz). Several hundred rotational transitions of propargylamine were recorded in the ground and three lowest excited vibrational states. The experiments were supported by high-level ab initio computations, mainly employed to characterize the vibrational state structure and to predict spectroscopic parameters unknown prior to this study. Results. The measured transition frequencies yielded accurate rotational constants and the complete sets of quartic and sextic centrifugal distortion constants for propargylamine in its vibrational ground state. 14N-nuclear quadrupole coupling constants were also determined. Rotational and quartic centrifugal distortion constants were also obtained for the low-lying excited states v13 = 1 (A′), v20 = 1 (A″), and v21 = 1 (A″). The a-type Coriolis resonance which couples the v13 = 1 and v21 = 1 levels was analyzed. Conclusions. The determined spectroscopic constants allowed for the compilation of a dataset of highly accurate rest frequencies for astrophysical purposes in the millimeter and submillimeter regions with 1σ uncertainties that are smaller than 0.050 MHz, corresponding to 0.03 km s−1 at 500 GHz in radial equivalent velocity.

Die Mikrowellen-Rotationsspektren des AgCl, AgBr und AgJ

1971 ◽  
Vol 26 (2) ◽  
pp. 240-244 ◽  
Author(s):  
J. Hoeft ◽  
F. J. Lovas ◽  
E. Tiemann ◽  
T. Törring
Keyword(s):  
Coupling Constants ◽  
Rotational Spectrum ◽  
Vibrational States ◽  
Molecular Constants ◽  
Quadrupole Coupling ◽  
Rotational Transitions

The observation of the low lying rotational transitions J = 0 →1 of AgCl and J = 2→3 of AgBr resulted in improved quadrupole coupling constants: 107, 109Ag35Cl: e qν Q (35Cl) = -36,50 (10) MHz (ν=0,1); 107.109Ag79Br; e q0 Q(79Br) =297,10(15) MHz, e q1 Q (79Br) =297,65 (15) MHz. In con­trast to former measurements of KRISHER and NORRIS we obtained the following constants of 107Ag79Br: Y01 = 1943,6420 (50) MHz, Y11 = -7,0745(70) MHz, re = 2,393100(29) Å. The unknown rotational spectrum of AgJ was found. Measurements of the transition J = 3 →4 in four vibrational states resulted in the determination of the following molecular constants: Y01 = 1345,1105(25) MHz, Y11= -4,2389(30) MHz, Y21 = 1,70(80) kHz, Y0,=-0,2540(2) kHz; re = 2,544611 (31) Å; e q0 Q(127J) =-1062,17(40) MHz, e q1 Q(127J) = -1064,81 (40) MHz.

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