scholarly journals New Investigation of Millimeter-Wave Rotational Spectrum of CCl3CN in Ground, v7= 1 and v8= 1 States

2008 ◽  
Vol 5 (4) ◽  
pp. 946-962
Author(s):  
Masoud Motamedi ◽  
Tahere Zohrevand
Keyword(s):  
Millimeter Wave ◽  
Ground State ◽  
Rotational Spectrum ◽  
Vibrational States ◽  
Rotational Spectra

The millimeter-wave rotational spectra of the ground and excited vibrational states v7=1 and v8=1 of the symmetric top molecule, CCl3CN, have been analyzed again. The B0= 1666.80894(13) MHz, DJ= 0.135023 (23) kHz, DJK= 0.60596 (45) kHz, HJ= -0.0192 (10) mHz, HJK= 1.188 (34) mHz and HKJ= -1.60 (21) mHz have been determined for ground state. The 𝓁 = ±1 series have been assigned and the rotational parameters including B7=1667.96659(25) MHz, (q+t)7=1.58855(94) MHz for v7=1 and B8=1667.08204 (31) MHz, (q+t)8= 1.6141(36) MHz for v8= 1 states were determined accurately.

Centrifugal Distortion Parameters of Fulminic Acid, HCNO, from the Millimeter-Wave Rotational Spectra

1971 ◽  
Vol 26 (1) ◽  
pp. 128-131 ◽  
Author(s):  
Manfred Winnewisser ◽  
Brenda P. Winnewisser
Keyword(s):  
Millimeter Wave ◽  
Ground State ◽  
Rotational Spectrum ◽  
Centrifugal Distortion ◽  
Vibrational States ◽  
Molecular Constants ◽  
Rotational Spectra ◽  
First Excited State ◽  
Bending Modes ◽  
Distortion Parameters

Abstract A newly designed millimeter-wave spectrometer has been employed for precise measurements of the millimeter-wave rotational spectrum of HCNO. Absorptions in several excited vibrational states as well as the ground state could be measured. The present paper presents the observed frequen­ cies and molecular constants obtained for the ground state and the first excited state of v4 and of v5, the vibrational bending modes

scholarly journals Study of Millimeter-Wave Rotational Spectra ofTrioxane in Ground, v(A), v1(E) = 1 and v2(E) = 1 States

2009 ◽  
Vol 6 (s1) ◽  
pp. S259-S279 ◽  
Author(s):  
Masoud Motamedi ◽  
Najmehalsadat Khademi
Keyword(s):  
Excited State ◽  
Excited States ◽  
Millimeter Wave ◽  
Ground State ◽  
Vibrational States ◽  
Rotational Spectra ◽  
First Time

The millimeter-wave rotational spectra of the ground and excited vibrational states v(A), v1(E) =1 and v2(E ) =1 of the oblate symmetric top molecule, (CH2O)3, have been analyzed again. The B0= 5273.25747MHz, DJ= 1.334547 kHz, DJk= -2.0206 kHz, HJ(-1.01 mHz), HJK(-3.80 mHz), and HKJ(4.1 mHz) have been determined for ground state. For non degenerate excited state, vA(1), the B = 5260.227723 MHz and DJand DJKwere determined 1.27171 kHz and -1.8789 kHz respectively. The 1=±1 series have been assigned in two different excited states v1(E) =1 and v2(E) =1.Most of the parameters were determined with higher accuracy compare with before. For the v2(E) =1 state the Cζ=-1940.54(11) MHz and qJ= 0.0753 (97) kHz were determined for the first time.

scholarly journals New Investigation of Millimeter-Wave Rotational Spectrum of CF3CN in the Excited Vibrational States v7=1 and v8=1

2007 ◽  
Vol 4 (1) ◽  
pp. 67-78
Author(s):  
Masoud Motamedi ◽  
Bahram Vahabzadeh Zargari
Keyword(s):  
Millimeter Wave ◽  
Rotational Spectrum ◽  
Vibrational States ◽  
Rotational Spectra

The millimeter-wave rotational spectra of the excited vibrational states v7=1 and v8=1 of the symmetric top molecule trifluoroacetonitrile, CF3CN, have been analyzed again. The ζ=±1 series have been assigned and the rotational parameters including B7=2944.9748(14) MHz, q+t=1.4505(16) MHz for v7=1 and B8=2950.4853(4) MHz, q+t= 3.6035(20) MHz for v8=1states were determined accurately.

scholarly journals Study of Millimeter-Wave Rotational Spectra of Phosphorus Trifluoride in Ground,v2= 1 and v4= 1 States

2009 ◽  
Vol 6 (3) ◽  
pp. 849-865 ◽  
Author(s):  
Masoud Motamedi ◽  
Tahere Zohrevand
Keyword(s):  
Millimeter Wave ◽  
Ground State ◽  
Vibrational States ◽  
Rotational Spectra

The millimeter-wave rotational spectra of the ground and excited vibrational states v2=1 and v4=1 of the symmetric top molecule, PF3, have been analyzed again. The B0= 7819.9907(13) MHz, DJ= 7.84984(41) kHz, DJk= -11.7644 (11) kHz, HJ= 15.678 (36) mHz, HJk= -66.46 (12) mHz and HkJ= 87.42 (15) mHz have been determined for ground state. The 1=±1 series have been assigned and the rotational parameters including B4=7823.09212(41) MHz, (q+t)4= -29.49200(65) MHz, rt=2.9465 (13) MHz and (Cζ)4= -3010.94684(41) MHz for v4=1 state were determined accurately

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.

Millimeter wave study of the ground state and several excited vibrational states of trioxane

1970 ◽  
Vol 34 (2) ◽  
pp. 190-205 ◽  
Author(s):  
Jean Bellet ◽  
Jean-Marcel Colmont ◽  
Jean Lemaire
Keyword(s):  
Millimeter Wave ◽  
Ground State ◽  
Vibrational States

Determination of a High Barrier Hindering Internal Rotation from the Ground State Spectrum. The Methylbarrier of 1-Butyne

1985 ◽  
Vol 40 (3) ◽  
pp. 263-266 ◽  
Author(s):  
G. Bestmann ◽  
H. Dreizler
Keyword(s):  
Internal Rotation ◽  
Ground State ◽  
Rotational Spectrum ◽  
Rotational Spectra

With 1-butyne a series of barrier determinations from rotational spectra in the torsional ground state of ethyl compounds was continued. The barrier is different to the value from an analysis of the rotational spectrum of the first torsional state.

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.

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