Temperature dependence of vibrational relaxation processes in sulfur crystals: Effect of isotopic impurities

Becucci, Maurizio; Castellucci, E.; Foggi, Paolo; Califano, S.; Dows, David A.

doi:10.1063/1.462424

Cited by 32 publications

(31 citation statements)

References 29 publications

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“…But the attempt of evaluating the defect-influenced anharmonic damping contribution from the corresponding contribution of the anharmonic ideal structure by multiplying it with a defect-determined parameter only cannot be supported from the point of view of a microscopic theory. Moreover, in contrast to the supposition of Becucci et al, 6 that the modification of anharmonic decay processes by isotopic impurities may be described by a dressing of the usual cubic and quartic anharmonic coupling constants by mass-change coefficients only, we have obtained instead a modification of the harmonic bath phonons by the isotopic disorder and therefore a modification of the decay channels itself.…”

Section: ͑25͒contrasting

confidence: 99%

“…According to the results obtained in Ref. 1 and discussed here, the temperature-independent contribution of the phenomenological description of Becucci et al 6 ͓Eq. ͑10͒ of Ref.…”

Section: ͑25͒supporting

confidence: 82%

“…This is clearly supported by the results of experimental investigations of frequencies and linewidths in natural and pure sulfur, 5,6 which show for both crystals and corresponding bands the same hightemperature behavior with different values. Additionally, the fitting attempts, made by Becucci et al, 6 indicate the presence of a defect-induced temperature-independent contribution to the linewidth, which of course effects the linewidth most at low temperatures and sometimes even dominates it. According to the results obtained in Ref.…”

Section: ͑25͒mentioning

confidence: 99%

See 2 more Smart Citations

Influence of isotopic disorder on phonon frequencies and phonon linewidths of an anharmonic crystal

Held¹,

Pfeiffer²,

Kuhn³

1997

Phys. Rev. B

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Based on a perturbation theory using Matsubara functions and a diagrammatic treatment, it is shown that the phonon linewidths of an anharmonic crystal with isotopic impurities include two different contributions, a disorder-induced temperature-independent part, caused by harmonic scattering processes of phonons at isotopic impurities, and a disorder-influenced temperature-dependent part, caused by anharmonic decay processes. Whereas in case of an anharmonic ideal crystal it is usual to restrict the corresponding self-energy on diagonal elements only, this is no longer sufficient in the presence of impurities. For that reason it is shown that only nondiagonal elements of the effective vertex function of the harmonic phonon propagator contribute to the disorder-induced contribution to the phonon linewidth, whereas the corresponding harmonic and the anharmonic frequency shifts are determined by diagonal and nondiagonal elements as well. As an application, numerical results of the disorder-induced temperature-independent as well as the disorder-influenced temperature-dependent contribution to the phonon linewidths of a diatomic linear chain with a single mass defect are presented. ͓S0163-1829͑96͒01346-X͔

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Section: ͑25͒contrasting

confidence: 99%

“…According to the results obtained in Ref. 1 and discussed here, the temperature-independent contribution of the phenomenological description of Becucci et al 6 ͓Eq. ͑10͒ of Ref.…”

Section: ͑25͒supporting

confidence: 82%

Section: ͑25͒mentioning

confidence: 99%

See 1 more Smart Citation

Influence of isotopic disorder on phonon frequencies and phonon linewidths of an anharmonic crystal

Held¹,

Pfeiffer²,

Kuhn³

1997

Phys. Rev. B

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“…It provides information about the dominant relaxation processes of the investigated vibration. In our case this dependence is nonlinear and was successfully fitted to the pure dephasing process [30][31][32]:…”

Section: Analysis and Discussionmentioning

confidence: 88%

Water ice at low temperatures and pressures: New Raman results

Furić

Volovšek

2010

Journal of Molecular Structure

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“…The temperature dependence of the bandwidth  provides information about the dominant relaxation processes of the investigated phonon. In our case this dependence is nonlinear and was successfully fitted to the pure dephasing process: 15,16 …”

Section: Resultsmentioning

confidence: 89%

Low‐wavenumber lattice vibrations and dynamics of 4,4′‐dibromobenzophenone

Volovšek

Kirin

Bistričić

et al. 2002

J Raman Spectroscopy

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The low-wavenumber (10-200 cm −1 ) polarized Raman spectra of 4,4 -dibromobenzophenone single crystal at different temperatures (10-295 K) and far-infrared spectra (20-200 cm −1 ) of powdered samples at room temperature were recorded. The assignment of the lattice vibrations based on the lattice dynamics calculation at k = 0, which takes into account the seven lowest intramolecular modes, is presented. The unusual temperature behavior of some bands was explained by dephasing relaxation processes.

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Temperature dependence of vibrational relaxation processes in sulfur crystals: Effect of isotopic impurities

Abstract: Articles you may be interested inTemperature dependence of the vibrational relaxation processes in natural and isotopically pure 32S8: Effect of the isotopic impurities on infrared phonon lifetimes

Cited by 32 publications

References 29 publications

Influence of isotopic disorder on phonon frequencies and phonon linewidths of an anharmonic crystal

Influence of isotopic disorder on phonon frequencies and phonon linewidths of an anharmonic crystal

Water ice at low temperatures and pressures: New Raman results

Low‐wavenumber lattice vibrations and dynamics of 4,4′‐dibromobenzophenone

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