Theory of atomic photoionization measurements

Jacobs, V. L.

doi:10.1088/0022-3700/5/12/019

Cited by 167 publications

(67 citation statements)

References 14 publications

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“…Other formulations of equivalent detail exist (e.g., ref. [33]) ; however, the j, representation has the distinct advantage of displaying explicitly the alternative contributions arising in the different stages of the photoionization process.…”

Section: Anisotropic Final-state Interactions Inmentioning

confidence: 99%

Angular Distributions of Photoelectrons and Non-Thermal Photoions From Atoms and Molecules

Dehmer

1978

J. Phys. Colloques

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RCsumC. -Durant ces dix dernikres annees, les distributions angulaires des photo-electrons ont kte exclusivement utilisees pour ktudier la dynamique des processus de photoionisation dans les atomes et les molkcules. Nous faisons le point, ici, sur les resultats les plus marquants survenus depuis la dernikre Conference Internationale d'il y a trois ans. De loin, les plus grands progres ont eu lieu pour les atomes, l'interst s'etant plus particulierement port6 sur les points suivants : amelioration de l'ordre zero (Hartree-Slater, Cooper-Zare), comprehension du paramttre d'asymetrie P(&), en considerant les correlations Clectroniques, les effets relativistes, les interactions de 1'Ctat final anisotropique. L'etude des gaz rares a bkneficik de l'ttroite coordination entre l'expkrience et la theorie, tandis que l'etude des atomes non spheriques est restee principalement theorique, mis a part les mesures rkcentes sur I'oxygkne atomique. Les etudes de distribution angulaire sur les molecules sont encore a un stade t r b preliminaire de dtveloppement. Ceci resulte du manque de mesures en fonction de la longueur d'onde, mises a part les experiences trks recentes, et l'absence de methodes theoriques pratiques et realistes. Le point sera donc fait sur ce travail recent, ainsi que sur une selection de travaux plus anciens concernant les molCcules et obtenus avec des raies de resonance. De plus, une nouvelle serie d'ktudes angulaires sur les molCcules -la distribution angulaire des ions non thermiques formes par photoionisation dissociative -fournissant des informations complCmentaires sur les mesures correspondantes avec des photoClectrons, sera presentee.Abstract. -During the last ten years, photoelectron angular distributions have been used extensively to study the dynamics of the photoionization process in atoms and molecules. Here we review some major advances in this body of work, with special emphasis on results emerging since the last Conference on VUV Radiation Physics three years ago. By far the greatest progress has occurred for atoms, where interest is focussed on improving our zero-order (Hartree-Slater, Cooper-Zare) understanding of the asymmetry parameter P(&), by considering electron correlations, relativistic effects, and anisotropic final-state interactions. The study of the rare gases has benefitted from extensive coordination between experiment and theory, whereas work on non-spherical atoms has been mainly theoretical, with the only measurements being performed very recently on atomic oxygen. Angular distribution studies on molecules are in a much earlier stage of development. Progress has been impeded by the lack of practical, realistic theoretical methods and wavelength-dependent measurements, both of which are becoming available only now. This recent work, together with selected topics from earlier resonance-line work on molecules will be reviewed. In addition, a new class of angle-dependent stud~es of molecules will be discussed -the angular distribution of non-thermal ions formed by dissociative ph...

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Section: Anisotropic Final-state Interactions Inmentioning

confidence: 99%

Angular Distributions of Photoelectrons and Non-Thermal Photoions From Atoms and Molecules

Dehmer

1978

J. Phys. Colloques

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“…This equivalence-that we have demonstrated algebraically-may be understood qualitatively as follows: from the Stokes parameter characterization of a light beam, elliptically polarized light differs from partially linearly polarized light in that the former has a non-zero s 3 , where s 3 measures the presence of circular polarization (Born and Wolf 1959, § 10.8.3). This component of circular polarization, which leads also to the phase coherence (measured by the Stokes parameters s 2 and s 3 ) of the elliptically polarized beam (Born and Wolf 1959, § 10.8.3), does not however affect the photoelectron angular distribution (Peshkin 1970, Jacobs 1972. Hence, as far as the angular distribution of photoelectrons is concerned, it makes no difference whether one uses elliptically polarized or partially linearly polarized light.…”

Section: 2)mentioning

confidence: 99%

“…Hence, as far as the angular distribution of photoelectrons is concerned, it makes no difference whether one uses elliptically polarized or partially linearly polarized light. However, these different light polarizations will affect other measurable properties of the final state that are sensitive to the presence of circularly polarized light, such as the photoelectron spin polarization (Jacobs 1972(Jacobs , p. 2266.…”

Section: 2)mentioning

confidence: 99%

“…Now by "partially polarized light," we mean partially linearly polarized light because partially circularly polarized light is equivalent to unpolarized light plus circularly polarized light, and circularly polarized light gives the same photoelectron angular distribution as unpolarized light (Peshkin 1970, Jacobs 1972). Thus we may for our present purpose consider partially polarized light as equivalent to two incoherent linearly polarized beams vibrating along orthogonal axes (Born and Wolf 1959, § 10.8…”

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confidence: 99%

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Effect of elliptically polarized light on the angular distribution of photoelectrons

Samson

Starace

1975

J. Phys. B: At. Mol. Phys.

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“…In a previous paper (Jacobs 1972), the density matrix formalism (Fano 1957) was employed to develop a theory of single-photon ionization for an atomic system of arbitrary complexity. In this paper, the density matrix formalism is used to derive an expression which determines the differential N-photon ionization cross section as a function of the polarization states of the target atom and the incident radiation.…”

Section: Introductionmentioning

confidence: 99%