ISSN:0021-2148    

DOI:10.1002/ijch.196900030

出版商:WILEY‐VCH Verlag    

年代:1969

数据来源: WILEY

摘要:

AbstractRecent studies of aromatic free radicals and electronically excited states using flash photolytic techniques in the microsecond and nanosecond ranges are reviewed. The technique and applications of laser flash photolysis are discussed.

ISSN:0021-2148    

DOI:10.1002/ijch.196900031

出版商:WILEY‐VCH Verlag    

年代:1969

数据来源: WILEY

摘要:

AbstractRadiationless transitions in isolated molecules are examined from the point of view of the breakdown of the Born‐Oppenheimer approximation. The intramolecular non‐radiative decay is considered in various limits and the radiative decay of coherently excited molecular levels is analy

ISSN:0021-2148    

DOI:10.1002/ijch.196900032

出版商:WILEY‐VCH Verlag    

年代:1969

数据来源: WILEY

摘要:

AbstractThe average coupling matrix element v of Jortner's theory for Intramolecular radiationless transitions is calculated by the methods of crystal physics (the Mössbauer effect and impurity optical absorption)

ISSN:0021-2148    

DOI:10.1002/ijch.196900033

出版商:WILEY‐VCH Verlag    

年代:1969

数据来源: WILEY

摘要:

AbstractIt is argued that efficient internal conversion in polyatomic molecules occurs when the energy gap between two potential energy surfaces is sufficiently small, so that, at finite nuclear velocities, the corrections to the Born‐Oppenheimer approximation can lead to significant transition probabilities. In particular this will occur near a conical intersection of two surfaces. An estimate of the transition probability is provided using the Zener criterio

ISSN:0021-2148    

DOI:10.1002/ijch.196900034

出版商:WILEY‐VCH Verlag    

年代:1969

数据来源: WILEY

摘要:

AbstractComputational studies of energy transfer in models of molecular collisions are presented and analyzed qualitatively and semi‐quantitatively. Particular attention is given to those approximations where the leading term is already in good qualitative agreement with the exact numerical results. In particular, results for the distorted wave approximation in an adiabatic basis are reported and compared with the exact results. It is argued that for slow molecular collisions, the efficiency of the transfer is determined by the “Franck Condon” overlap near the repulsive part of the intermolecular pote

ISSN:0021-2148    

DOI:10.1002/ijch.196900035

出版商:WILEY‐VCH Verlag    

年代:1969

数据来源: WILEY

摘要:

AbstractExact Numerical values for the transition probabilities between rotational states of a rigid diatomic molecule colliding with a structureless atom were obtained using “The Amplitude Density Function” Technique. Particular attention was given to the influence of a closed channel on the transition probabilities between open channels. Resonances corresponding to bound states in the closed channel were demonstrated, and the results were shown to agree with general resonance the

ISSN:0021-2148    

DOI:10.1002/ijch.196900036

出版商:WILEY‐VCH Verlag    

年代:1969

数据来源: WILEY

摘要:

AbstractExperimental results concerning predissociations of polyatomic positive ions in the gas phase are reviewed. These include the observation of “metastable” ions; photoionization efficiency curves; “metastable” ion decay curves and isotope effects. Examples are given for the three cases of predissociation. Predissociation by vibration is treated in greater detail and the data are compared with predictions of the quasi‐equilibrium theory (QET). Results concerning preionization of polyatomic negative ions are also included. The theoretical treatment of this problem is presented and discussed. Suggestions are made as to possible future developments in t

ISSN:0021-2148    

DOI:10.1002/ijch.196900037

出版商:WILEY‐VCH Verlag    

年代:1969

数据来源: WILEY

摘要:

AbstractA short account of the electron configuration of water, including symmetry properties, is given. These simple considerations permit the explanation of the results of photoelectron spectroscopy experiments and photoionization experiments; the2B2state of H2O+is predissociated. Excited states of water are all repulsive or predissociated, the more important fragments being OH2τ, OH2Σ+and O. Some repulsive states of H2O−are known, but the important low‐lying2A′ state is

ISSN:0021-2148    

DOI:10.1002/ijch.196900038

出版商:WILEY‐VCH Verlag    

年代:1969

数据来源: WILEY

摘要:

AbstractA brief survey is given of pressure broadening theory, with particular attention to impact phenomena. The basic collision processes that contribute to line broadening (such as phase shifts, amplitude modulation, reorientation, and sense reversal) and their effects are discussed. Subsequent line shape expressions for the broadening of resonance lines and the transition to nonresonant line shape are presented.

ISSN:0021-2148    

DOI:10.1002/ijch.196900039

出版商:WILEY‐VCH Verlag    

年代:1969

数据来源: WILEY