Nuclear quadrupole hyperfine structure in the rotational spectra of HCCH–N2O and Ar–N2O

1996 ◽  
pp. 2525-2526 ◽  
Author(s):  
Helen O. Leung
Keyword(s):  
Hyperfine Structure ◽  
Rotational Spectra ◽  
Nuclear Quadrupole

Rotational Spectrum of Aminoborane: Centrifugal Distortion Constants and Boron and Nitrogen Hyperfine Structure

1991 ◽  
Vol 46 (9) ◽  
pp. 770-776 ◽  
Author(s):  
Kirsten Vormann ◽  
Helmut Dreizler ◽  
Jens Doose ◽  
Antonio Guarnieri
Keyword(s):  
Hyperfine Structure ◽  
Spin Rotation ◽  
Coupling Constants ◽  
Rotational Spectrum ◽  
Centrifugal Distortion ◽  
Rotational Spectra ◽  
Quadrupole Coupling ◽  
Wave Region ◽  
Nuclear Quadrupole ◽  
Centrifugal Distortion Constants

AbstractThe boron and nitrogen hyperfine structure in the rotational spectra of two aminoborane isotopomers, 11 BH2NH2 and 10BH2NH2, has been investigated and the quadrupole coupling constants of boron 10B, 11B and nitrogen 14N have been determined. We get the following results for the nuclear quadrupole coupling constants: χaa(11B) = -1.684 (14) MHz, χbb(11B) = -2.212 (11) MHz, χcc(11B) = 3.896(11) MHz, χaa(10B) = -3.481 (11) MHz, χbb(10B) = -4.623 (14) MHz, χCC(10B) = 8.104 (14) MHz and xaa(14N) = 0.095 (9) MHz, χbb(14N) = 2.091 (8) MHz, χcf4 (14N)=-2.186 (8) MHz. These nitrogen quadrupole coupling constants are those of the 11BH2 NH2 isotopomer. Additionally we were able to determine two out of the three spin rotation coupling constants caa, cbb, and ccc of boron, caa(11 B = 55.2 (26) kHz, cbb(11B) = 6.62 (36) kHz, caa (10B) = 15.26 (69) kHz and cbb(10B) = 4.94 (70) kHz. The spin rotation coupling constants ccc had to be fixed to zero in both cases. Furthermore we measured the rotational spectra in the mm-wave region to determine all quartic and several sextic centrifugal distortion constants according to Watson's A and S reduction

14N Nuclear Quadrupole Hyperfine Structure in the Microwave Spectrum of Methyl Azide, CH3N3

1989 ◽  
Vol 44 (7) ◽  
pp. 669-674 ◽  
Author(s):  
N. Heineking ◽  
M.C.L. Gerry
Keyword(s):  
Hyperfine Structure ◽  
Ab Initio Calculation ◽  
Structural Information ◽  
Microwave Spectrum ◽  
Coupling Constants ◽  
Rotational Spectra ◽  
Isotopic Species ◽  
Quadrupole Coupling ◽  
Nuclear Quadrupole ◽  
First Time

Abstract The 14N nuclear quadrupole hyperfine structure in the rotational spectra of three isotopic species of methyl azide, CH3 14N3, CH3 15N14N2, and CH3 14N2 15N, has been resolved using microwave Fourier transform spectroscopy. The quadrupole coupling constants of 14N at all three positions have been evaluated and are compared with those from an ab initio calculation in the literature.Since the spectra of the substituted species have been obtained for the first time, they have provided new structural information: the rotational constants are consistent with a structure in which the NNN chain is slightly bent.

Boron and Nitrogen Hyperfine Structure in the Rotational Spectrum of Aminodifluoroborane

1991 ◽  
Vol 46 (10) ◽  
pp. 909-913
Author(s):  
◽  
Helmut Dreizler
Keyword(s):  
Hyperfine Structure ◽  
Coupling Constants ◽  
Rotational Spectrum ◽  
Centrifugal Distortion ◽  
Rotational Spectra ◽  
Quadrupole Coupling ◽  
Nuclear Quadrupole ◽  
Centrifugal Distortion Constants

AbstractThe boron and nitrogen hyperfine structure in the rotational spectra of aminodifluoroborane has been investigated and the quadrupole coupling constants of 11B and nitrogen have been determined. We get the following results for the nuclear quadrupole coupling constants: Χaa(11B) = - 1.971 (6) MHz, Xbb(11B) = 0.500(11) MHz, Xcc(11B) - 2.471 (11) MHz, and Xaa(14N) = 0.890 (5) MHz, Xbb(14N) = 2.303 (7) MHz, Xcc(14N) = - 3.193 (8) MHz. Additionally we determined rotational and centrifugal distortion constants according to Watson's A reduction.

Nuclear Quadrupole Hyperfine Structure and Methyl Torsional Fine Structure in the Rotational Spectra of N,N-Dimethylformamide and N-Nitrosodimethylamine

1993 ◽  
Vol 48 (4) ◽  
pp. 570-576 ◽  
Author(s):  
N. Heineking ◽  
H. Dreizler
Keyword(s):  
Fourier Transform ◽  
Fine Structure ◽  
Hyperfine Structure ◽  
Internal Rotation ◽  
Amino Nitrogen ◽  
Coupling Constants ◽  
Methyl Group ◽  
Rotational Spectra ◽  
Quadrupole Coupling ◽  
Nuclear Quadrupole

Abstract The complicated nuclear quadrupole hyperfine structure and methyl torsional fine structure in the rotational spectra of N,N-dimethylformamide and N-nitrosodimethylamine have been studied using microwave Fourier transform spectroscopy. It has been found that both molecules are rather similar in terms of their parameters of methyl group internal rotation as well as in terms of their amino nitrogen quadrupole coupling constants.

Nitrogen Hyperfine Structure in the Rotational Spectra of 4-Pyridinecarbaledhyde and 3-Pyridinecarbaldehyde

1989 ◽  
Vol 44 (1) ◽  
pp. 67-70 ◽  
Author(s):  
Detlef Stryjewski ◽  
Nils Heineking ◽  
Helmut Dreizler
Keyword(s):  
Hyperfine Structure ◽  
Ring System ◽  
Rotational Spectra ◽  
Nuclear Quadrupole

Abstract We have resolved and analysed the nuclear quadrupole hyperfine structure in the rotational spectra of 4-pyridinecarbaldehyde and 3-pyridinecarbaldehyde, C5H4NCHO. The results are discussed and compared to those of previously measured pyridine compounds. The electron withdrawing effect of the aldehyde-function, in the 3- and 4-position at the ring system, has been calculated, and the differences in the results are discussed.

Nitrogen Hyperfine Structure in the Rotational Spectra of Perfluoropyridine and Other Pyridine Derivatives

1987 ◽  
Vol 42 (2) ◽  
pp. 207-210 ◽  
Author(s):  
N. Heineking ◽  
H. Dreizler
Keyword(s):  
Hyperfine Structure ◽  
Rotational Spectrum ◽  
Pyridine Derivatives ◽  
Rotational Spectra ◽  
Nuclear Quadrupole

We resolved and analysed the nitrogen nuclear quadrupole hyperfine structure (hfs) in the rotational spectrum of perfluoropyridine C5F5N. The results are discussed and compared with those of previously measured pyridine compounds.

Sign in / Sign up

Export Citation Format

Share Document