Nuclear Quadrupole Hyperfine Structure of the Direct /-Type Transitions of the Fulminic Acid Isotopomers H12C14N16O and H13C14N16O

1996 ◽  
Vol 51 (3) ◽  
pp. 207-214
Author(s):  
Jürgen Preusser ◽  
Manfred Winnewisser
Keyword(s):  
Hyperfine Structure ◽  
Vibrational State ◽  
Line Broadening ◽  
Frequency Range ◽  
Vibrational States ◽  
Contour Fitting ◽  
Splitting Parameter ◽  
Nuclear Quadrupole ◽  
Significant Line ◽  
Large Amplitude Motion

The direct I- type transitions of H133C14N16O in the vibrational states (υ4,υ5) = (01) and (03) were measured in the frequency range from 18 to 40 GHz. These transitions show a nuclear quadrupole hyperfine structure caused by the 14N nucleus, which could partially be resolved at Doppler-limited resolution. The analogous transitions of the parent species. H12C14N16O, were remeasured. They displayed a very similar hyperfine structure, also partially resolved. The hyperfine patterns of both H12C14N16O and H13C14N16O were analysed by means of contour fitting s to the absorption profiles. The parameter ηseQq, which is responsible for the splittings, is determined to be 645(20) kHz for the vibrational state (01) and 890(44) kHz for the vibrational state (03) for H12C14N16O and 642(32) kHz for (01) and 898(22) kHz for (03) for H13C14N16O. This unexpectedly large splitting parameter for states involving the large amplitude motion υ5 (HCN bending) is discussed as another consequence of the quasilinearity of fulminic acid, in view of the fact that the analogous transitions for the vibrational state (10) (NCO bending) do not split or even show a significant line broadening at the resolution used for the present measurements

The Rotational Spectrum and Nuclear Quadrupole Coupling of CH35C1F2

1996 ◽  
Vol 51 (1-2) ◽  
pp. 129-132 ◽  
Author(s):  
Susana Blanco ◽  
Alberto Lesarri ◽  
Juan C. López ◽  
José L. Alonso ◽  
Antonio Guarnieri
Keyword(s):  
Fourier Transform ◽  
Vibrational State ◽  
Frequency Region ◽  
Coupling Constants ◽  
Rotational Spectrum ◽  
Frequency Range ◽  
Vibrational States ◽  
Ground Vibrational State ◽  
Quadrupole Coupling ◽  
Nuclear Quadrupole

Abstract The rotational spectrum of CH35CIF2 in the ground vibrational state has been measured in the frequency range 8-18 GHz using a waveguide Fourier transform microwave (FTMW) spectrometer in order to determine accurate nuclear quadrupole coupling constants. The spectra of the excited vibrational states ν5 = 1, ν6 = 1 and ν9 = 1 have been also observed and analyzed in the frequency region 8-250 GHz using FTMW, Stark, and source modulation spectrometers. Quadrupole coupling constants are also reported for these states.

The Hyperfine Structure in the Rotational Spectrum of CuCl

1977 ◽  
Vol 32 (12) ◽  
pp. 1477-1479
Author(s):  
E. Tiemann ◽  
J. Hoeft
Keyword(s):  
Hyperfine Structure ◽  
Vibrational State ◽  
Rotational Transition ◽  
Coupling Constants ◽  
Rotational Spectrum ◽  
Ground Vibrational State ◽  
Quadrupole Coupling ◽  
Magnetic Spin ◽  
Nuclear Quadrupole ◽  
Rotational Coupling

Abstract The hyperfine structure of the rotational transition J = 1 ← 0 of 63Cu35Cl in the ground vibrational state was observed. The analysis resulted in the following nuclear quadrupole coupling constants: 63Cu: e q0 Q= +16.08(20) MHz; 35Cl: eq0 Q = - 32.25(15) MHz. The influence of the small magnetic spin rotational coupling of both nuclei on the hyperfine spectrum is discussed.

Microwave Spectrum of N-Methyl Morpholine

1974 ◽  
Vol 52 (3) ◽  
pp. 434-439 ◽  
Author(s):  
S. C. Dass ◽  
R. Kewley
Keyword(s):  
Dipole Moment ◽  
Vibrational State ◽  
Microwave Spectrum ◽  
Coupling Constants ◽  
Vibrational States ◽  
Methyl Group ◽  
Ground Vibrational State ◽  
Chair Form ◽  
Quadrupole Coupling ◽  
Nuclear Quadrupole

The microwave spectrum of N-methyl morpholine has been investigated within the 8 to 40 GHz region. The observed rotational constants for the ground vibrational state are (in MHz), A = 4821.235(0.077), B = 2342.579(0.004), and C = 1719.452(0.003). The dipole moment components have been determined as (in D), μa = 1.21(0.02), μc = 0.10(0.03), and μ= 1.21(0.02). The values of these parameters show that the observed spectrum is due to the chair form with an equatorial methyl group. The 14N nuclear quadrupole coupling constants have the values (in MHz), χaa = 2.4(0.1), χbb =.6(0.3) and χcc = −5.0(0.2). Sets of rotational transitions due to six excited vibrational states have also been assigned.

Hyperfeinstruktur des RbBr / Hyperfine Structure of RbBr

1977 ◽  
Vol 32 (2) ◽  
pp. 123-125 ◽  
Author(s):  
E. Tiemann ◽  
B. Hölzer ◽  
J. Hoeft
Keyword(s):  
Hyperfine Structure ◽  
Vibrational State ◽  
Rotational Transition ◽  
Coupling Constants ◽  
Vibrational States ◽  
Ground Vibrational State ◽  
Isotopic Species ◽  
Quadrupole Coupling

The rotational transition J=2 → 3 of RbBr at 8.4 GHz was measured. The analysis of the hyperfine structure resulted in the quadrupole coupling constants of the isotopic species 85Rb79Br, 85Rb81Br, 87Rb79Br, and 87Rb81Br in the ground vibrational state. From the observation of 85Rb79Br in the excited vibrational states υ = 1 and 2 the vibrational dependence of the quadrupole coupling constants was derived:e qυ Q(85Rb) = (-47.20 + 0.28(υ+1/2) ±0.25) MHz;e qυ Q(79Br) = (3.08 + 0.75 (υ+1/2) ±0.30) MHz

Rotational Spectrum of Borane IMonoammoniate: Boron and Nitrogen Hyperfine Structure and Vibrational Structure

1991 ◽  
Vol 46 (12) ◽  
pp. 1060-1062 ◽  
Author(s):  
Kirsten Vormann ◽  
Helmut Dreizler
Keyword(s):  
Hyperfine Structure ◽  
Vibrational State ◽  
Coupling Constants ◽  
Rotational Spectrum ◽  
Vibrational States ◽  
Rotational Spectra ◽  
Quadrupole Coupling ◽  
Normal Spectrum ◽  
Ammonia Dimer ◽  
State 1

Abstract The boron and the nitrogen hyperfine structure in the rotational spectra of two borane monoammoniate isotopomers, 11BH3NH3 and 11BH3ND3 have been investigated and the quadrupole coupling constants of boron and nitrogen have been determined. It was also possible to determine the spin rotation constants CN of boron. In the spectrum of 11BH3NH3 we observed additional splittings which are not caused by quadrupole coupling. In the spectra of the ammonia dimer, (NH3)2, to our opinion the same kind of splittings occur. As interpretation of this phenomenon it was proposed that two different vibrational states cause the splitting. They were called ■x and ß. We use the same model for 11BH3NH3. The deuterated isotopomer 11BH3ND3 shows the normal spectrum of a symmetric top with two coupling nuclei, similar to the deuterated ammonia dimer (ND3)2. We obtained the following results: 11BH3ND3 in the x vibrational state, l/2(B + C) = 17517.21399(48) MHz, eQqaa(11B) - 2.584 (10) MHz, eQ gaa(14N) = -2.135 (5) MHz, CN(11B) = 4.59 (87) kHz, 11BH3NH3 in the ß vibrational state, 1/2(B + C) - 17517.27706 (52) MHz, eQqaa(11B) = 2.583 (8) MHz, eQqaa(14N) = -2.132 (5) MHz, CN(11B) = 4.76 (99) kHz, and 11BH3ND3, 1/2 (B + C) = 15076.79992 (41) MHz, eQqaa(11B) = 2.550 (7) MHz, eQqaa(14N) = -2.169 (4)"MHz, CN(11B) = 3.42 (67) kHz

33S Nuclear Hyperfine Structure in the Rotational Spectrum of Thiazole

1993 ◽  
Vol 48 (12) ◽  
pp. 1219-1222 ◽  
Author(s):  
U. Kretschmer ◽  
H. Dreizler
Keyword(s):  
Fourier Transform ◽  
Hyperfine Structure ◽  
Molecular Beam ◽  
Microwave Spectroscopy ◽  
Coupling Constants ◽  
Rotational Spectrum ◽  
Centrifugal Distortion ◽  
Quadrupole Coupling ◽  
Nuclear Quadrupole ◽  
Centrifugal Distortion Constants

Abstract We investigated the 33S nuclear quadrupole coupling of thiazole- 33S in natural abundance by molecular beam Fourier transform microwave spectroscopy. In addition the 14N nuclear quadrupole coupling could be analyzed with high precision. We derived the rotational constants A = 8529.29268 (70) MHz, B = 5427.47098 MHz, and C = 3315.21676 (26) MHz, quartic centrifugal distortion constants and the quadrupole coupling constants of 33S χaa = 7.1708 (61) MHz and χbb= -26.1749 (69) MHz and of 14N χ aa = -2.7411 (61) MHz and χbb = 0.0767 (69) MHz.

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