Millimeter-wave spectrum of 74GeH3F: Ground state

1983 ◽  
Vol 98 (2) ◽  
pp. 502-504 ◽  
Author(s):  
Stephen Cradock ◽  
John G. Smith
Keyword(s):  
Millimeter Wave ◽  
Ground State ◽  
Wave Spectrum

scholarly journals Millimeter Wave Spectrum and Centrifugal Distortion Analysis of Difluorochloromethane CHF2Cl in the Ground State

1990 ◽  
Vol 45 (9-10) ◽  
pp. 1165-1168 ◽  
Author(s):  
R. Spiehl ◽  
A. Guarnieri
Keyword(s):  
Millimeter Wave ◽  
Ground State ◽  
Wave Spectrum ◽  
Sixth Order ◽  
Centrifugal Distortion ◽  
Rotational Spectra ◽  
Vibrational Ground State ◽  
Distortion Analysis

Abstract The rotational spectra of CHF235Cl and CHF237Cl (CFC22) in the vibrational ground state between 42 and 214 GHz are reported. A centrifugal distortion analysis up to the sixth order is carried out.

scholarly journals The millimeter-wave spectrum of methyl ketene and the astronomical search for it

2018 ◽  
Vol 619 ◽  
pp. A92 ◽  
Author(s):  
C. Bermúdez ◽  
B. Tercero ◽  
R. A. Motiyenko ◽  
L. Margulès ◽  
J. Cernicharo ◽  
...  
Keyword(s):  
Excited State ◽  
Millimeter Wave ◽  
Ground State ◽  
Wave Spectrum ◽  
High Mass ◽  
Mass Star ◽  
Rotational Spectrum ◽  
Star Forming ◽  
Dark Clouds ◽  
Star Forming Regions

Context. The analysis of isomeric species of a compound observed in the interstellar medium (ISM) is a useful tool to understand the chemistry of complex organic molecules. It could, likewise, assist in the detection of new species. Aims. Our goal consists in analyzing one of the two most stable species of the C3H4O family, methyl ketene, whose actual rotational parameters are not precise enough to allow its detection in the ISM. The obtained parameters will be used to search for it in the high-mass star-forming regions Orion KL and Sagittarius B2, as well as in the cold dark clouds TMC-1 in the Taurus Molecular Cloud and Barnard 1 (B1–b). Methods. A millimeter-wave room-temperature rotational spectrum of methyl ketene was recorded from 50 to 330 GHz. The internal rotation analysis of its ground state and first torsional excited state was performed with the rho-axis method employing the RAM36 program. Results. More than 3000 transitions of the rotational spectrum of the ground state (Kamax = 18) and first torsional excited state (Kamax = 13) of methyl ketene were fitted using a Hamiltonian that contains 41 parameters with a root mean square of 44 kHz. Column density limits were calculated but no lines were detected in the ISM belonging to methyl ketene.

The Millimeter Wave Spectrum of DCNO: An Example of Current Measurements in the Frequency Range from 60 to 350 GHz

1974 ◽  
Vol 29 (4) ◽  
pp. 633-641 ◽  
Author(s):  
Manfred Winnewisser ◽  
Brenda P. Winnewisser
Keyword(s):  
Excited State ◽  
Millimeter Wave ◽  
Ground State ◽  
Preliminary Data ◽  
Wave Spectrum ◽  
Frequency Range ◽  
Simple Method ◽  
Efficient System ◽  
First Excited State ◽  
Bending Modes

An efficient system for preliminary data reduction is described which completes a recently developed data acquisition and reduction system for the measurement of millimeter wave absorption lines with the help of a dedicated computer. A simple method of automatically determining the absorption line centers is given. Rotational transitions of DCNO, measured with the above system, are reported for the ground state and the first excited state of each of the two bending modes ν4 and ν5. The rotational and rotation-vibration constants obtained for these states are B0 = 10,292.48340 (31) MHz, D0 = 3.5418 (10) kHz,Bν4 = 10,306.00780 (45) MHz, Dν4 = 3.6409 (22) kHz,Bν5 = 10,338.65942 (32) MHz, Dν5 = 3.6208 (16) kHz.The l-type doubling constants q.t0) and qt(1) agree with the values obtained previously from direct l-type doubling transitions.

The ground state of KO revisited: the millimeter and submillimeter spectrum of potassium oxide

2019 ◽  
Vol 21 (39) ◽  
pp. 21960-21965 ◽  
Author(s):  
Mark A. Burton ◽  
Benjamin T. Russ ◽  
Matthew P. Bucchino ◽  
Phillip M. Sheridan ◽  
Lucy M. Ziurys
Keyword(s):  
Excited State ◽  
Electronic State ◽  
Millimeter Wave ◽  
Ground State ◽  
Wave Spectrum ◽  
Ground Electronic State ◽  
Potassium Oxide ◽  
Direct Absorption

Measurement of the millimeter-wave spectrum of the KO radical, using direct absorption methods, suggests that the ground electronic state is X2Πi with a close-lying excited state approximately 120 cm−1 higher in energy.

Millimeter-wave spectrum of 4-cyanopyridine in its ground state and lowest-energy vibrationally excited states, ν20 and ν30

2020 ◽  
Vol 369 ◽  
pp. 111274 ◽  
Author(s):  
P. Matisha Dorman ◽  
Brian J. Esselman ◽  
Jieun E. Park ◽  
R. Claude Woods ◽  
Robert J. McMahon
Keyword(s):  
Excited States ◽  
Millimeter Wave ◽  
Ground State ◽  
Wave Spectrum ◽  
Vibrationally Excited
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