The relaxation of OH (v = 1) and OD (v = 1) by H2O and D2O at temperatures from 251 to 390 K

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Article on the relaxation of OH (v = 1) and OD (v = 1) by H₂O and D₂O at temperatures from 251 to 390 K.

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12 p.

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McCabe, D. C.; Rajakumar, B.; Marshall, Paul; Smith, Ian W. M. & Ravishankara, A. R. September 7, 2006.

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Article on the relaxation of OH (v = 1) and OD (v = 1) by H₂O and D₂O at temperatures from 251 to 390 K.

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12 p.

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Abstract: We report rate coefficients for the relaxation of OH(v = 1) and OD(v = 1) by H2O and D2O as a function of temperature between 251 and 390 K. All four rate coefficients exhibit a negative dependence on temperature. In Arrhenius form, the rate coefficients for relaxation (in units of 10−12 cm3 molecule−1 s−1) can be expressed as: for OH(v = 1) + H2O between 263 and 390 K: k = (2.4 ± 0.9) exp((460 ± 115)/T); for OH(v = 1) + D2O between 256 and 371 K: k = (0.49 ± 0.16) exp((610 ± 90)/T); for OD(v = 1) + H2O between 251 and 371 K: k = (0.92 ± 0.16) exp((485 ± 48)/T); for OD(v = 1) + D2O between 253 and 366 K: k = (2.57 ± 0.09) exp((342 ± 10)/T). Rate coefficients at (297 ± 1 K) are also reported for the relaxation of OH(v = 2) by D2O and the relaxation of OD(v = 2) by H2O and D2O. The results are discussed in terms of a mechanism involving the formation of hydrogen-bonded complexes in which intramolecular vibrational energy redistribution can occur at rates competitive with re-dissociation to the initial collision partners in their original vibrational states. New ab initio calculations on the H2O–HO system have been performed which, inter alia, yield vibrational frequencies for all four complexes: H2O–HO, D2O–HO, H2O–DO and D2O–DO. These data are then employed, adapting a formalism due to Troe (J. Troe, J. Chem. Phys., 1977, 66, 4758), in order to estimate the rates of intramolecular energy transfer from the OH (OD) vibration to other modes in the complexes in order to explain the measured relaxation rates—assuming that relaxation proceeds via the hydrogen-bonded complexes.

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  • Physical Chemistry Chemical Physics, 2006, Cambridge: Royal Society of Chemistry (Great Britain), pp. 4563-4574

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  • Publication Title: Physical Chemistry Chemical Physics
  • Volume: 8
  • Issue: 39
  • Page Start: 4563
  • Page End: 4574
  • Pages: 12
  • Peer Reviewed: Yes

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  • June 30, 2006

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  • August 7, 2006

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  • September 7, 2006

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  • March 17, 2015, 10:38 a.m.

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McCabe, D. C.; Rajakumar, B.; Marshall, Paul; Smith, Ian W. M. & Ravishankara, A. R. The relaxation of OH (v = 1) and OD (v = 1) by H2O and D2O at temperatures from 251 to 390 K, article, September 7, 2006; [Cambridge, England]. (digital.library.unt.edu/ark:/67531/metadc501402/: accessed October 18, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT College of Arts and Sciences.