Measurement of Absolute Infrared Absorption Intensities in Crystals

Hollenberg, J. Leland; Dows, David A.

doi:10.1063/1.1731636

Cited by 65 publications

(20 citation statements)

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“…Refractive indices were needed to measure ice thicknesses, and densities (ρ) were needed to derive IR band strengths (Hollenberg & Dows 1961). The density and reference refractive index of H 2 S used will be treated in the next section.…”

Section: Experimental Methodsmentioning

confidence: 99%

“…By the usual methods (Hollenberg & Dows 1961;Gerakines & Hudson 2015a, 2015b, band strengths (A′) can be determined for every IR feature of H 2 S and each of our thiols at multiple temperatures. However, we were mainly interested in each compound's S-H stretching feature near 2530 cm −1 (3.95 μm), and so in Table 1 we have tabulated A′ values for it for each amorphous compound.…”

Section: Comparisons and Trendsmentioning

confidence: 99%

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Infrared Spectra and Interstellar Sulfur: New Laboratory Results for H₂S and Four Malodorous Thiol Ices

Hudson

Gerakines²

2018

ApJ

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New infrared spectra are presented for H 2 S and four other sulfur-containing compounds, all thiols, at 10-140 K to aid in the study of interstellar and solar system ices. Infrared spectral changes on warming H 2 S and each thiol are described with an emphasis on the S-H stretching vibration at 2550-2525 cm −1 (λ=3.92-3.96 μm) as it is in a relatively unobscured part of the infrared spectra of interstellar and planetary ices. Infrared positions and band strengths for each thiol's S-H and C-H stretching vibrations are reported, along with the S-H band strength of H 2 S. Two band strengths of near-infrared features of CH 3 SH are included. Results for these compounds are compared, and some areas of agreement and disagreement with the literature are described.

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Section: Experimental Methodsmentioning

confidence: 99%

Section: Comparisons and Trendsmentioning

confidence: 99%

Infrared Spectra and Interstellar Sulfur: New Laboratory Results for H₂S and Four Malodorous Thiol Ices

Hudson

Gerakines²

2018

ApJ

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“…The thickness of the sample cell was of the order of a few microns for high methane concentrations and 2 nlm for the low concentrations; the small spacings were determined approximately by counting the interference fringes (10). The window material was either sapphire or Irtran-2 and the seals were achieved with 0.010 in.…”

Section: Methodsmentioning

confidence: 99%

Infrared spectra and structure of methane – noble gas mixed crystals: the influence of temperature and methane concentration on the v₃ vibration band of methane

Chamberland¹,

Belzile²,

Cabana³

1970

Can. J. Chem.

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The infrared spectra of CH,, at low concentrations in the noble gases, were obtained at temperatures ranging from 4 "K up to the respective boiling points of argon, krypton, or xenon. It is concluded from this study that methane occupies substitutional cavities in these lattices. Furthermore, it is established that the potential hindering the rotation of the molecules perturbs the higher rotational levels to a greater extent than the low lying levels.In a second series of experiments, the methane concentration was varied from 0.06 to 55 % for krypton; narrower ranges were used for argon and xenon. The experimental results clearly demonstrate that the influence of the CH, concentration is different for the three systems and that the fine structure does not result from molecular aggregation.The spectrum of 0.06% CD, in solid krypton shows fine structure which confirms the rotational origin of the four components observed for CH,. The CD, spectra previously published were complicated with additional lines that probably arose from the nonhomogeneity of the samples.Les spectres infrarouges du CH, en faibles concentrations dans les gaz nobles furent enregistres a des temperatures allant de 4 "K jusqu'aux points d'ebullition de I'argon, du krypton ou du xenon. Cette etude nous a permis de conclure que le methane occupe des cavites substitutionnelles dans ces reseaux.On a de plus constate que le potentiel s'opposant a la rotation des molecules se manifeste a un plus haut degrC sur les niveaux de rotation eleves que sur les premiers niveaux.La concentration de methane fut ensuite variCe de 0.06 a 55 % pour le krypton; des domaines moins Ctendus furent utilists pour I'argon ou le xenon. Les rCsultats exptrimentaux obtenus dimontrent clairement que I'effet de la concentration en CH, est different pour les trois systemes et que la structure fine n'est pas causee par I'agglomCration des molCcules.Le spectre du CD, en solution a 0.06% dans le krypton montre une structure fine qui confirme la nature rotationnelle des quatre composantes observees pour le CH,. Les spectres de CD, publies antirieurement Ctaient compliquCs par des raies additionnelles probablement attribuables a I'inhomogtnCitC des Cchantillons.

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“…Reuse of AIP content is subject to the terms at: http://scitation.aip.org/termsconditions. Downloaded to Lorentz effective field e 530 8 Polarizability in cubic angstroms. b See Table III.…”

Section: Calculated Intensitiesmentioning

confidence: 99%

Absolute Absorption Intensities of the Librational Modes of ClCN and BrCN

Friedrich

1970

The Journal of Chemical Physics

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The absolute absorption intensities of the two infrared-active librational modes in crystalline CICN and BrCN have been measured. The sums of the intensities of the two modes were 750±90 and 800±140 cm mM-l for CICN and BrCN, respectively. A dipolar coupling model was used to compute the expected intensities and the contributions of dipolar interactions to the frequencies of these lattice modes. The evaluation of the lattice sums in the direct or reciprocal lattice is discussed. The calculated intensities were 970 and 835 cm mM-l for CICN and BrCN, respectively.

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Measurement of Absolute Infrared Absorption Intensities in Crystals

Cited by 65 publications

References 2 publications

Infrared Spectra and Interstellar Sulfur: New Laboratory Results for H₂S and Four Malodorous Thiol Ices

Infrared Spectra and Interstellar Sulfur: New Laboratory Results for H₂S and Four Malodorous Thiol Ices

Infrared spectra and structure of methane – noble gas mixed crystals: the influence of temperature and methane concentration on the v₃ vibration band of methane

Absolute Absorption Intensities of the Librational Modes of ClCN and BrCN

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Measurement of Absolute Infrared Absorption Intensities in Crystals

Cited by 65 publications

References 2 publications

Infrared Spectra and Interstellar Sulfur: New Laboratory Results for H2S and Four Malodorous Thiol Ices

Infrared Spectra and Interstellar Sulfur: New Laboratory Results for H2S and Four Malodorous Thiol Ices

Infrared spectra and structure of methane – noble gas mixed crystals: the influence of temperature and methane concentration on the v3 vibration band of methane

Absolute Absorption Intensities of the Librational Modes of ClCN and BrCN

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Infrared Spectra and Interstellar Sulfur: New Laboratory Results for H₂S and Four Malodorous Thiol Ices

Infrared Spectra and Interstellar Sulfur: New Laboratory Results for H₂S and Four Malodorous Thiol Ices

Infrared spectra and structure of methane – noble gas mixed crystals: the influence of temperature and methane concentration on the v₃ vibration band of methane