Study of the Collective Excitations in H2 as Observed in Far Infrared Absorption

Cunsolo, S.; Dore, P.; Nencini, L.

doi:10.1007/978-1-4613-2511-6_28

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“…There seem to be two (possible) alternatives to explain the minimum in the I iso / d plots of Figure . Firstly, the CH 4 /H 2 system involves a solvent that displays quantum mechanical rotation throughout the supracritical region, liquid and solid phases. , Unfortunately, there is no mechanism that clearly invokes rotation and leads to such spectral behavior. Secondly, the structure (coordination number) of the solute must change as a function of density.…”

Section: Discussionmentioning

confidence: 99%

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Interaction Induced Raman Light Scattering Studies of CH₄/H₂Mixtures as a Function of Density

1997

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We have recently interrogated several binary supracritical mixtures by means of interaction-induced Raman light scattering originating from a probe molecule (supracritical methane) at a concentration of 10 mol % in a variety of supracritical solvent systems (e.g., Ar, CO2, CF4, etc.). In this paper we look at a very different kind of solvent, supracritical molecular hydrogen. It was chosen because of its well-known reorientational properties, i.e., quantum mechanical rotation in all phases (except perhaps metallic H2(s)). The results indicate that the I/d vs d plots are more complicated than earlier systems studied and give good evidence of additional numbers of H2 molecules clustered around the solute CH4. Hydrogen's absolute differential Raman rotational cross-section for ΔJ = 1 → 3 is very well known and combined with the cross-section of the methane probe molecules' ν1 symmetric stretching vibration, it was possible to quantify and compare the contributions of various mechanisms known to be present in interaction-induced Raman light scattering of a wide variety of solvents and to therefore judge their solvating capacities vis a vis CH4.

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Section: Discussionmentioning

confidence: 99%

“…There has also been a very recent review of ii processes edited by Tabisz and Neuman . In addition to those groups previously mentioned, others − have also made significant contributions. In particular, we will make use of Lolk and Robiette's 19 vibrational potential function results with respect to Coriolis coupling.…”

Section: Introductionmentioning

confidence: 95%

Interaction Induced Raman Light Scattering Studies of CH₄/H₂Mixtures as a Function of Density

1997

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Study of the Collective Excitations in H2 as Observed in Far Infrared Absorption

Cited by 1 publication

References 14 publications

Interaction Induced Raman Light Scattering Studies of CH₄/H₂Mixtures as a Function of Density

Interaction Induced Raman Light Scattering Studies of CH₄/H₂Mixtures as a Function of Density

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Study of the Collective Excitations in H2 as Observed in Far Infrared Absorption

Cited by 1 publication

References 14 publications

Interaction Induced Raman Light Scattering Studies of CH4/H2Mixtures as a Function of Density

Interaction Induced Raman Light Scattering Studies of CH4/H2Mixtures as a Function of Density

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Interaction Induced Raman Light Scattering Studies of CH₄/H₂Mixtures as a Function of Density

Interaction Induced Raman Light Scattering Studies of CH₄/H₂Mixtures as a Function of Density