Raman Investigation of the N<sub>2</sub>—O<sub>2</sub> Binary System as a Function of Pressure and Temperature.

Minenko, M.; Kreutz, Joerg; Hupprich, Thorsten; Jodl, H. J.

doi:10.1002/chin.200429008

Cited by 2 publications

(2 citation statements)

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“…3 The intensity of the Raman-active phonon sideband spectra in ␣-nitrogen 23 delivers the same result for coupling in ␣ and ␤ oxygen: S(O 2 )ϳS(N 2 )ϳ0.03. Since we know that the Raman cross sections of both substances are almost the same 24 we can compare these Raman results directly with results from FTIR absorption. Whereas by Raman scattering sideband intensities of O 2 and N 2 are comparable, the ir spectra show a dramatically different sideband ratio: I SB (O 2 )/I SB (N 2 )Ϸ20.…”

Section: A Region Of Internal Vibrationsmentioning

confidence: 97%

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: A Region Of Internal Vibrationsmentioning

confidence: 97%

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

Kreutz

Jodl

2003

Phys. Rev. B

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“…The intense oxygen vibron at about 1575 cm −1 , the nitrogen stretching mode at about 2365 cm −1 , and the lattice modes of O 2 -N 2 mixture in a low-frequency part of spectra characterized the Raman spectra collected at high pressure before laser heating (see the selected examples in Figures 1(a) and 1(b)). The pressure evolution of a characteristic splitting of O 2 and N 2 stretching modes as well as the pressure dependence of the relative intensities of the O 2 and N 2 vibrons were compared with the available studies of O 2 -N 2 mixture [28,29]. We estimate the oxygen concentration in all studied O 2 -N 2 samples to be within the range from 70% mol up to almost 100%.…”

Section: High-pressure Synthesis and Phase Relations Of No + Nomentioning

confidence: 99%

High‐Pressure Synthesis and Study of NO+NO3− and NO2+NO3− Ionic Solids

Kuznetsov

Dubrovinsky

Kurnosov

et al. 2009

Advances in Physical Chemistry

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Nitrosonium-nitrate NO+NO3− and dinitrogen pentoxide NO2+NO3− ionic crystals were synthesized by laser heating of a condensed oxygen-rich O2-N2 mixture compressed to different pressures, up to 40 GPa, in a diamond anvil cell (DAC). High-pressure/high-temperature Raman and X-ray diffraction studies of synthesized samples disclosed a transformation of NO+NO3− compound to NO2+NO3− crystal at temperatures above ambient and pressures below 9 GPa. High-pressure experiments revealed previously unreported bands in Raman spectra of NO+NO3− and NO2+NO3− ionic crystals. Structural properties of both ionic compounds are analyzed. Obtained experimental results support a hypothesis of a rotational disorder of NO+ complexes in NO+NO3− and indicate a rotational disorder of ionic complexes in NO2+NO3− solid.

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Raman Investigation of the N₂—O₂ Binary System as a Function of Pressure and Temperature.

Abstract: IR and Raman spectra D 6530 Raman Investigation of the N 2 -O 2 Binary System as a Function of Pressure and Temperature. -(MINENKO, M.; KREUTZ*, J.; HUPPRICH, T.; JODL, H.-J.; J.

Cited by 2 publications

References 1 publication

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

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

High‐Pressure Synthesis and Study of NO+NO3− and NO2+NO3− Ionic Solids

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Raman Investigation of the N2—O2 Binary System as a Function of Pressure and Temperature.

Abstract: IR and Raman spectra D 6530 Raman Investigation of the N 2 -O 2 Binary System as a Function of Pressure and Temperature. -(MINENKO, M.; KREUTZ*, J.; HUPPRICH, T.; JODL, H.-J.; J.

Cited by 2 publications

References 1 publication

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

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

High‐Pressure Synthesis and Study of NO+NO3− and NO2+NO3− Ionic Solids

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Raman Investigation of the N₂—O₂ Binary System as a Function of Pressure and Temperature.