Photoionization and Rydberg states of N2

Duzy, C.

doi:10.1063/1.432532

Cited by 50 publications

(11 citation statements)

References 33 publications

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“…Strong v-dependence of p is also observed [63] in production of the ground state of N: by photoionization of N, at 584 A. This has been tentatively attributed [65] to a strong R-dependence in the dipole amplitudes and channel phase shifts. The final example involves dependence of the angular distribution on rotational quantum number.…”

Section: Indirect Processesmentioning

confidence: 57%

“…Contributions to this field which employ methods containing a11 the essential information (e.g., molecular symmetry, proper asymptotic boundary conditions, phase shifts, orthogonality to core levels, etc.) include the work on H, [37] and N, [65] using a single-center-expansion representation, Dill's analysis [39] of the effect of rotational autoionization in H, using multichannel quantum defect theory, recent work [40, 70-721 on NZ and CO using the multiple-scattering model [73], and studies [74, 751 of the dependence of P on rotational and vibrational states in H, using an ellipsoidal coordinate system. The multiple-scattering work has recently been generalized to molecules of arbitrary symmetry and will be useful for extensive and realistic mapping of asymmetry parameters for molecules of arbitrary complexity and over broad energy ranges.…”

Section: Photoelectron Angular Distributionsmentioning

confidence: 99%

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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: Indirect Processesmentioning

confidence: 57%

Section: Photoelectron Angular Distributionsmentioning

confidence: 99%

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

Dehmer

1978

J. Phys. Colloques

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“…I 2 dQli 2 c (w.,(r,R) P·erl-¥ 11 (r,R))I (1) in the dipole length representation. Here r and R denote the set of electronic and nuclear coordinates, respectively, P • r is the operator for the interaction between the molecular electrons and the electromagnetic field where P is the light polarization vector, and n denotes the angles which specify the direction of photoemission in a coordinate system determined by the direction of polarization of the light and the molecular orientation.…”

Section: Theoretical Backgroundmentioning

confidence: 99%

“…1 While this assumption is not exact, it is usually sufficiently accurate to be of considerable use in the interpretation of those spectra. 2 Recent measurements of the He1 photoelectron spectra3 and angular distributions4- 6 for vibrational peaks of the ground X 2~; state of the N; appear to violate this assumption.…”

Section: Introductionmentioning

confidence: 99%

Energy dependence of the differential photoelectron cross sections of molecular nitrogen

Mintz

Kuppermann

1978

The Journal of Chemical Physics

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The angular distribution of photoelectron intensity for molecular nitrogen was studied using He I and Ne 1 resonance line discharge light sources. Studies of photoelectron angular distributions covering a range of photon energies, and thus a range of photoelectron energies, are possible using the weaker high order lines in each discharge as well as the principal lines. Peaks in three photoelectron bands of N 2 were studied at the photon energies 16.85, 19.78, 21.22, 23.09, and 23.74 eV, where possible. We find that the v' = 0 peak of the X 2 I.i band has abnormally high intensity and, at the higher photon energies, an abnormally low angular distribution asymmetry parameter, /3. Several mechanisms for this anomaly are discussed, including autoionization, the variation of electric dipole transition moments with internuclear distance, and possible shape resonance phenomena. None of these explanations is completely in agreement with all theoretical and experimental evidence.

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“…Nos últimos dez anos tem-se observado um interesse cres (1)(2)(3)(4)(5)(6)(7)(8)(9)(10)(11)(12)(13)(14)(15)(16)(17)60) de modo que 'l'(r,t)é, também, normalizada:…”

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Estudo teórico da fotoionização de moléculas diatômicas: nitrogênio (N2) e monóxido de carbono (CO)

Leal¹

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Photoionization and Rydberg states of N2

Cited by 50 publications

References 33 publications

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

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

Energy dependence of the differential photoelectron cross sections of molecular nitrogen

Estudo teórico da fotoionização de moléculas diatômicas: nitrogênio (N2) e monóxido de carbono (CO)

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