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Mengel, Markus; Winnewisser, Brenda P.; Winnewisser, M.

doi:10.1023/a:1022286509222

Cited by 7 publications

(4 citation statements)

References 9 publications

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“…There is continued growth in the number and types of matrix isolation studies that utilize molecular hydrogen (H 2 ) as the host matrix. − Cryogenic molecular hydrogen crystals are unique host materials for both the low temperature spectroscopy and chemistry of embedded chemical dopants for three basic reasons. First, solid molecular hydrogen (SMH) is a quantum crystal which means that the zero-point translational motion of each H 2 molecule around its equilibrium position in the crystal lattice is a significant fraction (e.g., 18%) of the nearest-neighbor spacing within the crystal .…”

Section: Introductionmentioning

confidence: 99%

High-Resolution Vibrational Spectroscopy of trans-Formic Acid in Solid Parahydrogen

Paulson

Anderson

2009

J. Phys. Chem. A

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We report high-resolution vibrational spectra of six normal modes of trans-formic acid (FA) in rapid vapor deposited solid parahydrogen (pH(2)) with particular emphasis on the carbonyl stretching mode (nu(3)) at approximately 1770 cm(-1). Infrared spectra in the nu(3) and 2nu(3) regions reveal that even in 99.99% enriched pH(2) samples, residual orthohydrogen (oH(2)) present in the solid preferentially clusters to FA producing measurable shifts in the nu(3) transition frequency. The individual FA(oH(2))(n) cluster peaks in the size range from n = 0 to n = 5 are resolved, permitting unambiguous assignment of the nu(3) and 2nu(3) transition frequencies and linewidths for FA with a first solvation shell (n = 0) of only pH(2) molecules. This n = 0 feature is well fit by a Lorentzian line shape with a line width of 0.214(6) cm(-1) and 0.45(2) cm(-1) for nu(3) and 2nu(3), respectively, which is surprisingly broad for a small nonrotating molecule trapped in solid pH(2). Implications of the broad FA nu(3) Lorentzian line shape in terms of homogeneous and inhomogeneous broadening mechanisms are discussed.

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Section: Introductionmentioning

confidence: 99%

High-Resolution Vibrational Spectroscopy of trans-Formic Acid in Solid Parahydrogen

Paulson

Anderson

2009

J. Phys. Chem. A

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“…[4] and [5] for the water monomers, and apply it to the main oH 2 -water complex peaks straddling the v 3 H 2 0 and V3 D 2 0 band origins. Using symmetric top quantum numbers (J,K) we assign the oH 2 -water complex peaks just to the blue of the Ooo <-0ol water monomer transitions as (0,0) +--(1,1), and those just to the red of the 1o0 <-000 monomer transition as (1,1) <-(0,0).…”

Section: F Oh 2 -Oh 2 0 Complexes and (Oh2)-water Clustersmentioning

confidence: 99%

“…The Winnewissers' solid hydrogen spectroscopic opus (1)(2)(3)(4)(5)(6) has yielded the discovery of several new rovibrational transitions, including the novel class of condensed phase "triple transitions," in which three hydrogen molecules cooperate to absorb a single photon (6). Their application of high-resolution high-sensitivity Fourier transform infrared (FTIR) spectrometry has produced an extensive compilation of observations, covering most of the 600-14000 cm"I region, which are unparalleled in their internal self-consistency.…”

Section: Introductionmentioning

confidence: 99%

Matrix isolation spectroscopy of H2O, D2O, and HDO in solid parahydrogen

FAJARDO¹

2004

Journal of Molecular Structure

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Public reporting burlenror this collection of information is estimated to average 1 hour per response, including the time for reviewing instructions, searching existing data sources, gathering and maintaining the data needed, and completing and reviewing this collection of information. Send comments regarding this burden estimate or any other aspect of this collection of information, including suggestions for reducing this burden to Department of Defense, Washington Headquarters Services, Directorate for Information ABSTRACTWe present infrared (IR) absorption spectra over the 800-7800 cm"1 region of cryogenic parahydrogen (pH 2 ) solids doped with H20, D 2 0 and HDO molecules. Analysis of the rovibrational spectra of the isolated H 2 0, D 2 0 and HDO monomers reveals their existence as very slightly hindered rotors, typically showing only 2 to 5 % reductions in rotational constants relative to the gas phase. The nuclear spin conversion (NSC) of metastable J = 1 ortho-H 2 0 (oH20) and para-D 2 0 (pD 2 0) molecules follow first order kinetics, with single exponential decay lifetimes at T = 2.4 K of 1900±100 s, and 860±50 s, respectively. We report without discussion some absorptions of water clusters produced during sample annealing. We report and assign a number of absorptions to oH2-water pairs or "complexes." The main features of the oH 2 -H 2 0 and oH 2 -D 2 0 spectra are explained qualitatively by assuming a semi-rigid C 2 , structure with the oH2 acting as a proton donor to the 0 atom. Surprisingly, NSC of oH 2 -water complexes proceeds at very nearly the same rate as for the corresponding water monomer. We report unassigned spectra of larger (oH2)n-water clusters, and the even more surprising observation of the prolonged survival of 01-20 and pD 2 0 molecules clustered with several o0-2 molecules. We report and assign a number of water dopant-induced IR absorption features of the pH2 host, along with cooperative water-pH 2 transitions in which the vibrational excitation of the pH2 solid is accompanied by a pure rotational transition of the water dopant.

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“…The present paper is not a result of rigorous investigations towards the understanding of the liquid hydrogens but it simply emerges from the fact that we have recorded various liquid hydrogen and deuterium spectra as a matter of completeness in connection with our long-standing efforts to observe weak transitions in the spectra of the corresponding solids [5][6][7][8][9][10]. One of the motivations for the present publication was the interest in our data for an application in which the absorption spectrum of the liquid parahydrogen could be used to monitor the filling status of a cryogenic tank in a zero-g environment.…”

Section: Introductionmentioning

confidence: 99%

Overtone spectra of parahydrogen and orthodeuterium in the liquid phase

Mengel¹,

Winnewisser²,

Winnewisser³

2000

Can. J. Phys.

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We report the results of our observations of liquid parahydrogen in the mid-infrared and of liquid parahydrogen and orthodeuterium in their first and second overtone regions using a Bruker IFS 120 HR Fourier transform spectrometer. We have determined intensity parameters for individual absorption features where possible and indicate analogies between the spectrum of the liquid and the corresponding spectrum of the solid phase of the hydrogens. PACS Nos.: 33.20Ea, 33.70Fd, 67.90+zRésumé : Utilisant un spectromètre Bruker IFS 120 HR à transformée de Fourier, nous avons observé du parahydrogène en phase liquide dans la bande centrale infrarouge, ainsi que du parahydrogène et de l'orthodeutérium en phase liquide dans les régions des première et de deuxième harmoniques. Nous avons déterminé les paramètres d'intensité caractéristiques d'absorption lorque c'était possible et nous soulignons les analogies entre les spectres des hydrogènes en phase liquide et leurs spectres correspondants dans la phase solide.[Traduit par la rédaction]

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Untitled

Cited by 7 publications

References 9 publications

High-Resolution Vibrational Spectroscopy of trans-Formic Acid in Solid Parahydrogen

High-Resolution Vibrational Spectroscopy of trans-Formic Acid in Solid Parahydrogen

Matrix isolation spectroscopy of H2O, D2O, and HDO in solid parahydrogen

Overtone spectra of parahydrogen and orthodeuterium in the liquid phase

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