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91.
Solvent and solvent isotope effects on the vibrational cooling dynamics of a DNA base derivative 总被引:1,自引:0,他引:1
Vibrational cooling by 9-methyladenine was studied in a series of solvents by femtosecond transient absorption spectroscopy. Signals at UV and near-UV probe wavelengths were assigned to hot ground state population created by ultrafast internal conversion following electronic excitation by a 267 nm pump pulse. A characteristic time for vibrational cooling was determined from bleach recovery signals at 250 nm. This time increases progressively in H2O (2.4 ps), D2O (4.2 ps), methanol (4.5 ps), and acetonitrile (13.1 ps), revealing a pronounced solvent effect on the dissipation of excess vibrational energy. The trend also indicates that the rate of cooling is enhanced in solvents with a dense network of hydrogen bonds. The faster rate of cooling seen in H2O vs D2O is noteworthy in view of the similar hydrogen bonding and macroscopic thermal properties of both liquids. We propose that the solvent isotope effect arises from differences in the rates of solute-solvent vibrational energy transfer. Given the similarities of the vibrational friction spectra of H2O and D2O at low frequencies, the solvent isotope effect may indicate that a considerable portion of the excess energy decays by exciting relatively high frequency (>/=700 cm-1) solvent modes. 相似文献
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93.
H. H. Willard J. J. Thompson E. Kasper P. Slawik A. W. Middleton K. Seelkopf H. Taeger P. Schmidt F. Weyrauch A. Necke H. Müller A. J. Lindsey B. Park E. J. Lewis O. B. Winter Helen M. Robinson F. W. Lamb E. J. Miller C. E. Willoughby E. S. Wilkins E. O. Kraemer A. Jílek und J. Kota 《Fresenius' Journal of Analytical Chemistry》1936,106(4-6):200-207
Ohne Zusammenfassung 相似文献
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Anthony PL Arnold RG Band HR Borel H Bosted PE Breton V Cates GD Chupp TE Dietrich FS Dunne J Erbacher R Fellbaum J Fonvieille H Gearhart R Holmes R Hughes EW Johnson JR Kawall D Keppel C Kuhn SE Lombard-Nelsen RM Marroncle J Maruyama T Meyer W Meziani Z Middleton H Morgenstern J Newbury NR Petratos GG Pitthan R Prepost R Roblin Y Rock SE Rokni SH Shapiro G Smith T Souder PA Spengos M Staley F Stuart LM Szalata ZM Terrien Y Thompson AK White JL Woods M Xu J Young CC Zapalac G 《Physical review letters》1993,71(7):959-962
98.
G. Gerbier D. Bertrand J. Guy P. Marage M. Aderholz N. Armenise J. H. Bartley J. P. Baton V. Brisson R. Belusevic D. Brou F. W. Bullock M. Calicchio E. F. Clayton T. Coghen A. M. Cooper-Sarkar O. Erriquez P. J. Fitch P. O. Hulth G. T. Jones P. Kasper H. Klein C. Kochowski M. Lagraa S. Leighton-Davis R. Middleton D. B. Miller M. M. Mobayyen D. R. O. Morrison M. Neveu S. Nuzzo S. O'Neale M. A. Parker P. Petiau J. Sacton R. A. Sansum N. Schmitz E. Simopoulou M. Talebzadeh K. Varvell C. Vallee A. Vayaki W. Venus H. Wachsmuth J. Wells W. Wittek E. Zevgolatakos BEBC WA Collaboration 《Zeitschrift fur Physik C Particles and Fields》1985,29(1):15-28
A sample of over 25,000 fully measured neutrino and antineutrino charged current interactions in BEBC includes 192 dilepton candidates. The prompt signal after subtraction of background is 41 ±7µ+ e -, 35±7µ+µ- events from \(\bar v\) interactions, and 32±7µ-µ+ events from ν interactions. There are 2 trileptons, µ-µ- e + and µ-µ-µ+. Results are compared with other experimental data and with the standard model. Limits to prompt like sign µ+ e +, µ+µ+ and µ-µ- signals are given and compared with other experiments and with theoretical calculations. 相似文献
99.
M.B. Smith G.J. Campbell R. Chapman P.O. Tjøm R.A. Bark G.B. Hagemann N. Keeley D.J. Middleton H. Ryde K.-M. Spohr 《The European Physical Journal A - Hadrons and Nuclei》1999,5(1):37-42
High-spin states in 167Hf, populated in the 141Pr(30Si, p3n)167Hf reaction, have been studied using the nordball Ge detector array. Three rotational cascades have been observed for the first time and the previously-known level scheme
has been extended to significantly higher spin. Band-crossing effects are discussed within the framework of Woods-Saxon cranking
calculations and are found to be in good agreement.
Received: 9 April 1999 / Revised version: 13 May 1999 相似文献
100.
M.B. Smith R. Chapman J.F.C. Cocks O. Dorvaux K. Helariutta P.M. Jones R. Julin S. Juutinen H. Kankaanpää H. Kettunen P. Kuusiniemi Y. Le Coz M. Leino D.J. Middleton M. Muikku P. Nieminen P. Rahkila A. Savelius K.-M. Spohr 《The European Physical Journal A - Hadrons and Nuclei》1999,5(1):43-47
Excited states in the Z= 85 nucleus 197At have been identified for the first time using the recoil-decay-tagging (RDT) technique. The excitation energy of these
states is found to be consistent with the systematics of neutron-deficient astatine nuclei and with theoretical calculations
indicating that the nucleus may be deformed in its ground state.
Received: 8 January 1999 相似文献