Nature of infrared-active phonon sidebands to internal vibrations: Spectroscopic studies of solid oxygen and nitrogen

Brodyanski, A.; Medvedev, S. A.; Vetter, Martin; Kreutz, Jörg; Jodl, H. J.

doi:10.1103/physrevb.66.104301

Cited by 13 publications

(34 citation statements)

References 51 publications

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“…15 In short, every cooling process from gas to ␣-phase has been performed extremely slow ͑0.5-1 K/h͒, the solid sample was annealed slightly below the crystallization point (⌬T ϳ0.1-0.5 K) for about 10-20 h, and we realized again a substantially slow cooling rate ͑0.05 K/h͒ at each phase transition region (liquid→␥, ␥→␤, ␤→␣). The optical quality of monoclinic regions of our O 2 -samples was investigated by polarized Raman spectra of vibron and libron modes.…”

Section: Methodsmentioning

confidence: 99%

“…In addition the resonance and environmental frequency shift of the O 2 vibron have been determined based on the above assumption and compared to vibron frequencies from Raman spectroscopy. 15 In principle, with accurate Raman frequency data of oxygen isotopes vibration in 16 O 2 or vibrational overtones one can achieve this key characteristic of a fundamental vibron zone based on one set of experimental data only ͑and thus prove indirectly the correctness of the deconvolution procedure of Ref. 15͒.…”

Section: Introductionmentioning

confidence: 99%

“…Löwen et al 14 studied, by Raman scattering and FTIR absorption, the vibron-phonon excitations as a function of temperature ͑5-40 K͒, whose nature was analyzed and explained later on by Brodyanski et al 15 In the latter publication a vibration of a ''single'' molecule was assumed to be the origin of the ir-active sideband. To prove this assumption precise frequency Raman measurements of sidebands are necessary for a comparison.…”

Section: Introductionmentioning

confidence: 99%

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Elementary excitations in condensed oxygen (α,β,γ, liquid) by high-resolution Raman scattering

Kreutz

Jodl

2003

Phys. Rev. B

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Elementary excitations ͑magnon, libron, vibron, and their combinations͒ of solid and liquid oxygen samples of high optical quality have been investigated by high resolution Raman spectroscopy in the temperature range 10-90 K. From spectra we deduced band frequency, bandwidth, and band shape of all modes as a function of temperature. In particular we registered in a very narrow temperature range ⌬TϽ0.5 K at the ␣-␤ phase transition libron spectra of the ␣ phase as well as of the ␤ phase; from the coexistence of both phases we can unambiguously follow that this phase transition is of first order. We deduced also from Raman spectra hints about the magnetic interaction, like vibron-magnon mode coupling ͑unexpected broad vibron band in ␣-O 2 ), or two libron excitations. A joint analysis of the vibron frequencies of isotopomers in the 16 O 2 sample allows us to describe the key characteristics of the fundamental energy zone ͑environmental and resonance frequency shifts͒ in both low temperature phases. The Raman-active phonon sideband of the internal vibrations in ␣-and ␤-O 2 is clearly shifted towards higher frequencies compared to the ir-active one; i.e., both kinds of phonon sidebands therefore possess a different physical origin. We determined the integrated intensity of the magnon Raman band as a function of temperature which is proportional to the magnetic order parameter and which can be modeled by the spin-spin correlation function ͗S i S j ͘.

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Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Elementary excitations in condensed oxygen (α,β,γ, liquid) by high-resolution Raman scattering

Kreutz

Jodl

2003

Phys. Rev. B

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“…Sample preparation of a mixture with a desired concentration and cooling the sample to an intended p-T point for optical studies is a delicate task (see details [5]). Whereas the same procedure for structural studies is less complicated.…”

Section: Methodsmentioning

confidence: 99%

“…orientational disorder with structural order) is only slightly different from the liquid phase. We studied carefully the (b-l)-N 2 phase transition [5,11]: the volume jump at T bl is small; dominant short-range orientational order between neighbouring molecules in b and liquid phase play a role. As an example we show in Fig.…”

Section: Solid-liquid Phase Transitionmentioning

confidence: 99%

From optical spectra to phase diagrams—the binary mixture N2–CO

Vetter

Jodl

Brodyanski

2007

Low Temperature Physics

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We investigated the T-c% phase diagram of the binary system N 2 -CO. From changes in IR spectra of all kinds of mode excitations (phonons, vibrons) we were able to determine the temperature of phase transitions (solid-solid, solid-liquid). The improvements in comparison to structural investigations by x-rays or electrons are the following: sample growing and handling with perfect optical and thermodynamic quality; determination of actual concentration (N 2 ) x (CO) y from optical spectra; reduction of thermal hysteresis by careful cooling-heating cycles of the samples.

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