Infrared spectrum of HNCO between 8 and 80 cm−1

1984 ◽  
Vol 62 (12) ◽  
pp. 1452-1466 ◽  
Author(s):  
L. Fusina ◽  
M. Carlotti ◽  
B. Carli
Keyword(s):  
Infrared Spectrum ◽  
Ground State ◽  
Far Infrared ◽  
Spectroscopic Constants ◽  
Centrifugal Distortion ◽  
Excited Vibrational State ◽  
Millimetre Wave ◽  
Band Origin ◽  
Centrifugal Distortion Constants ◽  
Infrared Data

The infrared spectrum of isocyanic acid, HNCO, has been recorded in the range 8–80 cm−1 with a resolution of about 0.004 cm−1a-type and b-type rotational transitions have been measured and assigned in the ground state and in the ν4 = 1, ν5 = 1, ν6 = 1, and ν5 = 2 vibrational states.Improved values of the ground state rotational and centrifugal distortion constants in the Ir S-reduced Hamiltonian of Watson have been obtained in a simultaneous analysis of our measurements and microwave, millimetre-wave, and far infrared data reported previously. Sub-band origins and effective spectroscopic constants have been determined for each excited vibrational state. An accurate value for the ν6 band origin, at 656.287 cm−1, has been deduced.

The infrared spectrum of aminodifluoroborane, NH2BF2: Partial assignment of the fundamentals and analysis of the band near 1608 cm−1

1988 ◽  
Vol 66 (8) ◽  
pp. 2088-2099 ◽  
Author(s):  
H. M. Jemson ◽  
W. Lewis-Bevan ◽  
M. C. L. Gerry
Keyword(s):  
Infrared Spectrum ◽  
Gas Phase ◽  
Spectroscopic Constants ◽  
Centrifugal Distortion ◽  
Coriolis Interaction ◽  
Partial Assignment ◽  
Rotational Perturbation ◽  
Band Origin ◽  
Centrifugal Distortion Constants ◽  
First Time

The infrared spectrum of gas phase aminodifluoroborane, NH2BF2, has been observed for the first time. A partial assignment to the fundamental vibrations has been made. The [Formula: see text] band has been recorded at high resolution, and the rotational and centrifugal distortion constants of NH211F2 have been obtained in both the ground and 21 levels. A small rotational perturbation in the 21 level has been attributed to a perpendicular Coriolis interaction. Using a newly written least-squares fitting program, spectroscopic constants of the unseen level have been evaluated, including its band origin and the Coriolis coupling coefficient. Possible identities of the unseen level are suggested.

Detection of the Infrared Spectrum of Cyanobutadiyne, HC5N

1981 ◽  
Vol 36 (10) ◽  
pp. 1052-1056 ◽  
Author(s):  
Koichi Yamada ◽  
Gisbert Winnewisser
Keyword(s):  
Infrared Spectrum ◽  
Diode Laser ◽  
Vibrational State ◽  
Tunable Diode Laser ◽  
Centrifugal Distortion ◽  
Laser Spectrometer ◽  
Excited Vibrational State ◽  
Diode Laser Spectrometer ◽  
Band Origin ◽  
Centrifugal Distortion Constants

The CN stretching band, ν2, of cyanobutadiyne has been detected by a tunable diode laser spectrometer in the wavenumber range from 2250 to 2260 cm-1. The P-and R-branch transitions, up to P(77) and R(75), of the fundamental band were identified and measured with the accuracy of 0.001 cm-1. The band origin was obtained to be 2256.12406(13) cm-1. The rotational and centrifugal distortion constants in the excited vibrational state, B′ and D′, were also determined.

Ground state spectroscopic constants of isothiocyanic acid, HNCS, from its microwave and millimeter wave spectra combined with far infrared data

1979 ◽  
Vol 78 (2) ◽  
pp. 189-202 ◽  
Author(s):  
Koichi Yamada ◽  
Manfred Winnewisser ◽  
Gisbert Winnewisser ◽  
L.B. Szalanski ◽  
M.C.L. Gerry
Keyword(s):  
Millimeter Wave ◽  
Ground State ◽  
Far Infrared ◽  
Spectroscopic Constants ◽  
Wave Spectra ◽  
Infrared Data

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.

Ground state spectroscopic constants and electric dipole moment of D14N12C32S from its microwave and millimetre wave spectra

1978 ◽  
Vol 56 (10) ◽  
pp. 1297-1307 ◽  
Author(s):  
L. B. Szalanski ◽  
M. C. L. Gerry ◽  
G. Winnewisser ◽  
K. Yamada ◽  
M. Winnewisser
Keyword(s):  
Dipole Moment ◽  
Stark Effect ◽  
Coupling Constants ◽  
Spectroscopic Constants ◽  
Wave Spectra ◽  
Centrifugal Distortion ◽  
Millimetre Wave ◽  
Quadrupole Coupling ◽  
Centrifugal Distortion Constants ◽  
First Time

The microwave and millimetre wave spectra of D14N12C32S in its ground vibrational state have been investigated in the frequency region 8–210 GHz. A large number of a-type Q branch and b-type P and R branch transitions up to J = 62 have been assigned and measured for the first time. Their frequencies have been combined with those of the a-type R branches up to K = 5 in an analysis for rotational, centrifugal distortion, and 14N quadrupole coupling constants. Constants obtained, in Watson's S reduction formalism, are: rotational constants in megahertz: A0 = 705 511(370); B0 = 5500.4391(15); C0 = 5445.2252(15); quartic centrifugal distortion constants in kilohertz: Dj = 1.0926(25); Djk = 1333.4(12); d1 = 3.455(5) × 10−2d2 = −7.8(14) × 10−3; 14N quadrupole coupling constants in megahertz: χaa = 1.19(6), χbb−χcc <0.05. The b-component of the dipole moment, μb, has been measured using the Stark effect as 1.08(15) D; this, when combined with μa = 1.67(3) D gives a total dipole moment of 1.99(15) D, essentially parallel to the HN bond.

Far-infrared spectrum and ground state constants of methyl amine

1987 ◽  
Vol 126 (2) ◽  
pp. 443-459 ◽  
Author(s):  
Nobukimi Ohashi ◽  
Kojiro Takagi ◽  
Jon T. Hougen ◽  
W.Bruce Olson ◽  
Walter J. Lafferty
Keyword(s):  
Infrared Spectrum ◽  
Ground State ◽  
Far Infrared ◽  
Methyl Amine

Millimetre wave spectrum of methyl mercaptan

1980 ◽  
Vol 58 (11) ◽  
pp. 1640-1648 ◽  
Author(s):  
R. M. Lees ◽  
M. Ali Mohammadi
Keyword(s):  
Interstellar Medium ◽  
Least Squares ◽  
Wave Spectrum ◽  
Methyl Mercaptan ◽  
Rotational Spectrum ◽  
Centrifugal Distortion ◽  
Millimetre Wave ◽  
Torsion Vibration ◽  
Vibration Rotation ◽  
Centrifugal Distortion Constants

An investigation of the rotational spectrum of CH332SH, one of the most recent molecules to be detected in the interstellar medium, has been carried out over the 25–107 GHz region. The frequencies of a-type Δk = 0 R-branch transitions have been measured for the J = 1 ← 0 up to J = 4 ← 3 multiplets for torsional states νt = 0–3. In addition, many P-, Q-, and R-branch transitions with Δk ≠ 0 have been identified in order to provide a catalogue of lines for potential radio astronomical applications. Improved values of rotational and centrifugal distortion constants, a-type torsion–vibration–rotation interaction constants, and torsional barrier parameters (V3 = 444.76 cm−1; effective V6 = −2.07 cm−1) have been determined from least-squares analyses of the spectra.

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