ISSN:0005-9021    

DOI:10.1002/bbpc.19680720202

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1968

数据来源: WILEY

摘要:

AbstractPhotolysis of NO in the vacuum ultraviolet yielded N2, O2, NO2, and N2O. When the photolysis was carried out using the 1633 Å line of bromine, the N2initially formed was found to be enriched in nitrogen‐15. The dependence of the enrichment on several parameters was studied, including temperature, pressure, the initial isotope ratio, and inert gases. The enrichment of the N2in N15N14over N228produced in the photolysis was due to relatively more N15O being excited, and reacting before isotope scrambling occurred by energy transf

ISSN:0005-9021    

DOI:10.1002/bbpc.19680720204

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1968

数据来源: WILEY

摘要:

AbstractA technique has been developed for the determination of the quantum yield of ozone photolysis at low pressures. A continuous flow system was used, and the rate of ozone decomposition was calculated from changes in intensity of the chemiluminescent reaction between ozone and nitric oxide. Some preliminary determinations of relative quantum yields are presented, which appear to indicate that chain propagation processes are unimportant at pressures below about 0.5 Torr.

ISSN:0005-9021    

DOI:10.1002/bbpc.19680720205

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1968

数据来源: WILEY

摘要:

AbstractThe pressure dependence of the formation ratio of ethylene to acetylene in the photolysis of ethane at 1470 and 1577 Å has been studied, and the data have been analyzed according to the reaction scheme,The values ofks/kdand φ3/φ1were obtained at both wavelengths. The C2H4species produced in the photolysis of propane at 1470 Å following to the reaction,was found to undergo the reactions analogous to the above scheme and the corresponding values ofks/kdand φ3/φ2were obt

ISSN:0005-9021    

DOI:10.1002/bbpc.19680720206

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1968

数据来源: WILEY

摘要:

AbstractThe quantum yields for methanol photodecomposition have been found to be pressure dependent. Apart from methanol itself, other gases (alkane, N2, SF6, CO2, Ar, Kr, Xe) are effective in promoting the transition to dissociative states. A collision induced predissociation is postulated and the relative efficiencies of the different gases analyzed using a model based on simple degenerate perturbation theory.

ISSN:0005-9021    

DOI:10.1002/bbpc.19680720207

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1968

数据来源: WILEY

摘要:

AbstractThe krypton and xenon photosensitized exchange reaction between hydrogen and deuterium occurs with a quantum yield close to unity. Initial rate studies as a function of total hydrogen pressure indicate that homogeneous as well as heterogeneous reactions contribute to product formation. A mechanism with a strong interaction between excited sensitizer atom and substrate molecule is suggested to be responsible for the transfer of energy in this system.

ISSN:0005-9021    

DOI:10.1002/bbpc.19680720208

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1968

数据来源: WILEY

摘要:

AbstractThe data for benzene, hexafluorobenzene, fluorobenzene, toluene,o‐xylene, and pyridine are briefly summarized and critically examined. There are marked uncertainties in the fractions of absorbing molecules which cross over to triplet states and doubt is expressed about the validity of existing methods. The importance of the vibrational level formed in the absorption act is emphasized since some processes such as isomerization appear to be competitive with vibrational relaxation even at moderate pressures. In the case ofo‐xylene existing data do not permit a decision to be made as to whether isomerization tom‐ andp‐xylene occurs through the singlet or through the triplet state. It is embarrassing to note that for some molecules the sums of process yields for the initially formed excited singlet states exceed unity. More and better data are badly

ISSN:0005-9021    

DOI:10.1002/bbpc.19680720209

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1968

数据来源: WILEY

摘要:

AbstractFrom the vibrational structure of the electronic emission spectra of benzene, toluene, naphthalene and phenanthrene we obtained information about the intermolecular transfer as well as the internal conversion of vibrational energy in the excited singlet state. In the case of naphthalene characteristic collisional frequencies for the energy transfer to foreign gases (He, Ar, H2,n‐hexane, benzene) could be measured. The internal conversion of vibrational levels was studied at vapour pressures less than 0.2 mm. It may be stated that the conversion rate of total‐symmetric levels of benzene is less than the rate constant of fluorescence, but that the conversion rate of adequate levels of toluene, naphthalene and phenanthrene is much hig

ISSN:0005-9021    

DOI:10.1002/bbpc.19680720210

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1968

数据来源: WILEY

摘要:

AbstractAbsolute collision frequencies were obtained for the loss of internal energy of an energetically defined isolated molecule. These values are an order of magnitude less than predicted from the kinetic theory of gases. Measurements were made by a differential comparison of the lifetime of isolated molecules with that in the presence of an inert gas. The lifetime spectrum gives absolute rate constants in the excited state, the differential spectrum gives energy transfer information. Measurements were made continuously over a broad range of wavelengths involving the first two excited states of β‐naphthylami

ISSN:0005-9021    

DOI:10.1002/bbpc.19680720211

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1968

数据来源: WILEY

ISSN:0005-9021    

DOI:10.1002/bbpc.19680720212

出版商:Wiley‐VCH Verlag GmbH&Co. KGaA    

年代:1968

数据来源: WILEY