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Asymmetric profile of the totally symmetric stretching band in Raman spectra of bis(trimethylsilyl)acetylene


Mohaček Grošev, Vlasta; Furić, Krešimir
Asymmetric profile of the totally symmetric stretching band in Raman spectra of bis(trimethylsilyl)acetylene // Fizika A, 14 (2005), 2; 219-224 (podatak o recenziji nije dostupan, članak, znanstveni)


Naslov
Asymmetric profile of the totally symmetric stretching band in Raman spectra of bis(trimethylsilyl)acetylene

Autori
Mohaček Grošev, Vlasta ; Furić, Krešimir

Izvornik
Fizika A (1330-0008) 14 (2005), 2; 219-224

Vrsta, podvrsta i kategorija rada
Radovi u časopisima, članak, znanstveni

Ključne riječi
Raman; asymmetric bandshape; glassy crystal

Sažetak
The asymmetric band profile of the triple stretching C=C Raman band in bis(trimethylsilyl)acetylene was decomposed into a higher and a lower wavenumber part, each described as one half of a Lorentzian bandshape with its own halfwidth (Gamma_high and Gamma_low), but with common band centre and maximum point. Gamma_high and Gamma_low were fitted at seventeen different temperatures ranging from 110 K to 323 K (the melting point occurring roughly at 290 K).It was found that lower wavenumber side of the band was considerably wider than the higher wavenumber side, throughout the whole temperature interval chosen. This unexpected crystal band asymmetry present together with the "normal" phonon spectrum may indicate freezing of orientational disorder of methyl groups, while molecular centres of mass remain positioned on the Bravais lattice - like in the case of so called glassy crystals. The asymmetry of the band above 290 K suggests the existence of a nonisotropic liquid state.

Izvorni jezik
Engleski

Znanstvena područja
Fizika



POVEZANOST RADA


Projekt / tema
0098019
0098022

Ustanove
Institut "Ruđer Bošković", Zagreb

Citiraj ovu publikaciju

Mohaček Grošev, Vlasta; Furić, Krešimir
Asymmetric profile of the totally symmetric stretching band in Raman spectra of bis(trimethylsilyl)acetylene // Fizika A, 14 (2005), 2; 219-224 (podatak o recenziji nije dostupan, članak, znanstveni)
Mohaček Grošev, V. & Furić, K. (2005) Asymmetric profile of the totally symmetric stretching band in Raman spectra of bis(trimethylsilyl)acetylene. Fizika A, 14 (2), 219-224.
@article{article, year = {2005}, pages = {219-224}, keywords = {Raman, asymmetric bandshape, glassy crystal}, journal = {Fizika A}, volume = {14}, number = {2}, issn = {1330-0008}, title = {Asymmetric profile of the totally symmetric stretching band in Raman spectra of bis(trimethylsilyl)acetylene}, keyword = {Raman, asymmetric bandshape, glassy crystal} }