Xenon Matrices Research Articles

Infrared Absorption Spectra of LiF and Li2F2 in Solid Argon, Krypton, and Xenon Matrices

The infrared absorption spectra of LiF and Li2F2 isolated in solid argon, krypton, and xenon have been investigated from 2 to 35 μ. Infrared frequencies of both molecules have been obtained, and the assignment of the B2u and B3u modes of Li2F2 has been made assuming a planar rhomboid structure, (Vh). An interesting case of a so-called ``matrix effect'' is also presented.

Infrared Spectrum and Thermodynamic Properties of Gaseous Sulfur Trioxide

The infrared spectrum of sulfur trioxide was obtained under prism resolution in the gaseous state and in xenon matrices at liquid-nitrogen temperature. In both cases a satisfactory vibrational assignment of the monomeric SO3 spectrum could be made on the basis of a simple D3h symmetry model. The observed gas phase fundamentals were v3(e′) = 1391, v4(e′) = 529, and v2(a2″) = 495 cm—1. The matrix fundamentals were essentially the same as those of the gas phase except that the v2(a2″) mode was shifted to 464 cm—1. A normal coordinate treatment of the SO3 molecule was carried out and potential constants were determined for both Urey-Bradley and simplified valence force fields. Three weak absorption bands of S3O9 were also detected in the gas-phase spectrum. From the temperature and pressure variation of the intensities of these bands it was estimated that for the trimerization reaction at 298°K, Kp was approximately 1 atm—2 and ΔH298° was approximately 30 kcal/mole of S3O9. The values of the thermodynamic properties of monomeric SO3 were computed for the ideal gaseous state using the rigid rotor harmonic oscillator approximation at 1 atm from 100° to 1500°K.

Infrared Spectrum of Lithium Fluoride Monomer by Matrix Isolation

A method has been developed which can be used to observe the infrared spectrum of high temperature vapors. It combines the techniques of matrix isolation with that of Knudsen effusion. The infrared spectrum of matrix isolated lithium fluoride has been observed in argon, krypton, xenon, and nitrogen matrices. The observed frequencies in the various matrix materials are shifted approximately 7% to 14% from the measured gas fundamental at 900 cm−1. These shifts can be explained by the interactions of the trapped molecule with its surrounding neighbors, based on a model which estimates the change in magnitude of the electrostatic, inductive, and dispersive interactions during the course of a molecular vibration. These effects are particularly large in lithium fluoride due to its sizable dipole moment.

Near-Infrared Absorption Spectra of Ortho- and Para-H2O in Solid Xenon and Argon

The near-infrared absorption spectra of H2O trapped in solid argon and xenon have been studied at 20°K. The spectra, taken at concentrations of H2O to matrix of 1:600, exhibit structure which is analyzed in terms of the known rotational and vibrational constants of the H2O molecule. The results show that in solid xenon and argon matrices, the monomer H2O exists as two modifications, one of which is rotating in its ground vibrational state. The theoretical intensities for the spectral bands of H2O gas at 20°K are calculated and shown to agree with the bands observed in H2O-xenon. The changes in the observed intensities for other matrices are discussed. The changes in the spectra of the films when they are warmed to 35°K are shown and discussed.

Imine and Imine-d Radicals Trapped in Argon, Krypton and Xenon Matrices at 4.2°K.1

ADVERTISEMENT RETURN TO ISSUEPREVArticleNEXTImine and Imine-d Radicals Trapped in Argon, Krypton and Xenon Matrices at 4.2°K.1M. McCarty Jr. and G. W. RobinsonCite this: J. Am. Chem. Soc. 1959, 81, 17, 4472–4476Publication Date (Print):September 1, 1959Publication History Published online1 May 2002Published inissue 1 September 1959https://doi.org/10.1021/ja01526a009RIGHTS & PERMISSIONSArticle Views85Altmetric-Citations38LEARN ABOUT THESE METRICSArticle Views are the COUNTER-compliant sum of full text article downloads since November 2008 (both PDF and HTML) across all institutions and individuals. These metrics are regularly updated to reflect usage leading up to the last few days.Citations are the number of other articles citing this article, calculated by Crossref and updated daily. Find more information about Crossref citation counts.The Altmetric Attention Score is a quantitative measure of the attention that a research article has received online. Clicking on the donut icon will load a page at altmetric.com with additional details about the score and the social media presence for the given article. Find more information on the Altmetric Attention Score and how the score is calculated. Share Add toView InAdd Full Text with ReferenceAdd Description ExportRISCitationCitation and abstractCitation and referencesMore Options Share onFacebookTwitterWechatLinked InReddit PDF (627 KB) Get e-Alerts Get e-Alerts

Matrix Isolation Studies: Infrared Spectra of Intermediate Species in the Photolysis of Hydrazoic Acid

The matrix isolation method has been used to investigate the photolysis of hydrazoic acid (HN3) suspended in xenon, argon, and nitrogen matrices at 20°K. Infrared spectra of the photolyzed material in argon and nitrogen matrices show absorption bands of NH3 and a number of other prominent spectral features that are probably due to unstable molecules, including intermediates in the formation of NH3. In a xenon matrix no new bands are observed on photolysis of HN3 at 20°K, but the presence of the imine radical (NH), or of nitrogen and hydrogen atoms, is inferred from the formation of NH4N3 when the material is warmed to 70°K. The mechanism of photolytic production of radicals in a matrix is examined, and the probable importance of the heat of fusion of the matrix is discussed. The utility of the matrix isolation technique in the infrared study of unstable reaction intermediates is demonstrated.