Fracton vibrations in vitreous SiO2 as revealed from Raman spectroscopy study

Chmel, A. E.; Smirnov, A. N.; Shashkin, V. S.

doi:10.1134/1.1371361

Cited by 3 publications

(3 citation statements)

References 17 publications

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“…As known, these modes provide the resonant interaction of microwave radiation with matter namely with organism. The essential problem in low frequency (Rayleigh wing) spectroscopy of solids is the study of fractons resonances in microcracks with typical frequencies from units to a dozen cm −1 [5].…”

Section: Introductionmentioning

confidence: 99%

Four-photon laser spectroscopy of solids in 0–0.15 THz

2005

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Four-photon coherent spectroscopy of fused quartz, crown glass K8 and NaCl crystal in 0-5 cm −1 have been done. It was established that the spectra contain the Brillouin resonances on longitudinal and transversal hypersound, as well as distinct resonances at ∼1.6 cm −1 , which can be attributed to hydroxyl (OH) rotations. The fine structure of Rayleigh wing scattering in fused quartz has been observed for the first time. The detected lines 0.18 cm −1 and 0.37 cm −1 (5.4 and 11.1 GHz, respectively) are attributed to spheroidal modes ν 22 and ν 32 of SiO 2 spheres with the diameter ∼760 nm.Intensity, a.u.

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Section: Introductionmentioning

confidence: 99%

Four-photon laser spectroscopy of solids in 0–0.15 THz

2005

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“…The specific interest to the spectroscopic activity in this range is stimulated also by the study of light scattering on acoustical phonons and searching for the new translational and rotational intermolecular modes. The essential problem in low frequency or Rayleigh wing spectroscopy of solids is the study of fracton's resonances of cracks with typical frequencies from units to dozen cm −1 [3]. When the size of interrogated volume is comparable with dimensions of local heterogeneity the observed spectrum has to exhibit a few peaks of longitudinal and transversal optical phonons caused by existence of a few hypersound velocity (inside and outside the heterogeneity).…”

Section: Introductionmentioning

confidence: 99%

“…where χ (3) is the cubic susceptibility of the medium, proportional to the correlation function of optical anisotropy fluctuations, and E (1) and E (2) are the amplitudes of the interacting fields and hence I s ∝ |χ (3) | 2 I 2 1 I 2 is the intensity of registered signal. The laser fields interact coherently with an ensemble of molecules (or quasi-particles in solids) and control the phase of here's motions: optical, acoustical and heat phonons in the volume, where the beams with frequencies ω 1 and ω 2 overlap.…”

Section: Introductionmentioning

confidence: 99%

Four photon laser spectroscopy of local heterogeneities in solids in 0 – 60 GHz

Бункин

Першин

2006

Laser Phys. Lett.

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Abstract:The spectra of coherent four photon scattering in fused quartz and crown glass K8 have been measured in the range ±2 cm −1 . It's shown that both samples contain the features of Brillouin scattering on longitudinal and transversal hypersound. In the samples the sharp resonances of OH molecules rotations are detected for the first time in the range 1.3−1.6 cm −1 . In fused quartz the fine structure of spectrum in the range ±0.3 cm The fragment of the spectrum in the range ±0.3 cm −1 . Arrows mark the resonances of SiO 2 nanospheres own spherical modes

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Four‐photon laser spectroscopy of fused quartz and crown glass at 0–60 GHz

Бункин

Першин

Nurmatov

et al. 2007

J Raman Spectroscopy

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The low wavenumber spectra of fused quartz and crown glass K8 in the range 0.1-2 cm −1 at room temperature were measured by the four-wave mixing technique. The experimental scheme is based on using both second harmonics of a neodynium-doped yttrium aluminium garnet (Nd : YAG) pulsed laser and dye laser as a tuning source. The pulse-to-pulse deviation of the dye laser frequency is used to obtain the derivative spectra as an additional data source. It was established that the spectra contain a number of narrow (Ä0.1 cm −1 ) lines. The data could be fitted only by assuming that the Brillouin resonances on longitudinal and transverse sound, as well as the distinct resonances at ∼1.5 cm −1 , which can be attributed to hydroxyl (OH) molecular rotations, were involved in the four-photon scattering process. The fine structure of the Rayleigh wing scattering in fused quartz was observed for the first time. The detected lines, 0.165 cm −1 and 0.26 cm −1 (5.0 and 7.8 GHz, respectively), are attributed to the spheroidal modes n 20 and n 30 of SiO 2 spheres with a diameter 880 ± 30 nm. The closely lying eigen modes n 00 , n 10 and n 12 are unresolved with a central peak at ±0.1 cm −1 . The 0.4 cm −1 resonance lines in crown glass is attributed to be a manifestation of four-photon scattering from a second sound phonon.

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Fracton vibrations in vitreous SiO2 as revealed from Raman spectroscopy study

Cited by 3 publications

References 17 publications

Four-photon laser spectroscopy of solids in 0–0.15 THz

Four-photon laser spectroscopy of solids in 0–0.15 THz

Four photon laser spectroscopy of local heterogeneities in solids in 0 – 60 GHz

Four‐photon laser spectroscopy of fused quartz and crown glass at 0–60 GHz

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