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Structures of vibrational absorption bands of the SiF4 molecule in a low-temperature nitrogen matrix
We have studied the IR absorption spectra of diluted mixtures SiF 4 /M = 1/6000–1/10 000 in an N 2 matrix at 11 K (for comparison, the spectra of SiF 4 in Ar and Xe matrices have also been studied). It has been shown that, in solid nitrogen, the appearance of doublets is observed both in the range o...
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Published in: | Optics and spectroscopy 2014-10, Vol.117 (4), p.525-533 |
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Main Authors: | , , , |
Format: | Article |
Language: | English |
Subjects: | |
Citations: | Items that this one cites Items that cite this one |
Online Access: | Get full text |
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Summary: | We have studied the IR absorption spectra of diluted mixtures SiF
4
/M = 1/6000–1/10 000 in an N
2
matrix at 11 K (for comparison, the spectra of SiF
4
in Ar and Xe matrices have also been studied). It has been shown that, in solid nitrogen, the appearance of doublets is observed both in the range of the ν
3
band of the SiF
4
(
28
SiF,
29
SiF
4
, and
30
SiF
4
) isotopologues of the SiF
4
molecule and in the range of the ν
1
+ ν
4
, ν
2
+ ν
3
, and ν
1
+ ν
3
bands of
28
SiF
4
, whereas, in the range of the 2ν
3
band of
28
SiF, a triplet appears. In order to analyze the influence of the matrix on the spectrum of free SiF
4
molecules, we have used a model that makes it possible to successively calculate (i) the spectrum of SiF
4
in terms of the model of local modes, (ii) the structure of a matrix composed by 864 N
2
molecules + a rigid SiF
4
molecule using the Monte Carlo method, and (iii) the interaction of matrix particles with local dipole moments in the approximation of dipole-induced dipole and dipole-quadrupole interactions. The model describes satisfactorily the low-frequency shift of bands in the nitrogen matrix. All obtained experimental and theoretical results are consistent with the assumption that two kinds of stable trapping centers of SiF
4
molecules obeying the
T
d
symmetry are realized in the nitrogen matrix. |
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ISSN: | 0030-400X 1562-6911 |
DOI: | 10.1134/S0030400X14100233 |