Photoionization of atoms and molecules

Samson, James A. R.

doi:10.1016/0370-1573(76)90012-0

Cited by 95 publications

(18 citation statements)

References 234 publications

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“…and obtained agreement with experiment 60 to within 1% at threshold, within 4% at 1 Ry above threshold, and within 12% at 1.9 Ry above threshold. Application of the hyperspherical coordinate method to the excitation process in (7) is in progress.…”

Section: Photoionization Plus Excitationsupporting

confidence: 79%

Trends in the theory of atomic photoionization

Starace

1980

Appl. Opt.

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Section: Photoionization Plus Excitationsupporting

confidence: 79%

Trends in the theory of atomic photoionization

Starace

1980

Appl. Opt.

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“…So far rotational structure in photoelectron spectra could be clearly resolved only in the case of UV photoionization of H 2 [27][28][29]. In our studies of OH-, SH , and SD-, carried out with an effective resolution AE of 5-7meV, different rotational branches were resolved for the first time in photoelectron spectrometry of negative ions; two examples are shown in Figs.…”

Section: Rotational Structure In Photodetachment Of Oh- Sh Sd : Lmmentioning

confidence: 73%

High resolution photoelectron spectrometry of negative ions: Rotational transitions in laser-photodetachment of OH?, SH?, SD?

1981

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An apparatus for high resolution photoelectron spectrometry of negative ions is described. With this machine, energy spectra of electrons detached from OH , SH , and SD-ions by 488.0 nm and 514.5 nm radiation have been measured with a resolution of 5-7 meV. The rotational branches have been clearly resolved and the electron angular distributions have been determined for the different branches. The measured rotational structure has been reproduced in model calculations; for SH-, our results confirm the threshold model of Walker. The following rotational constants for the respective negative ions have been derived: B0(OH-)=18.75(15)c m 1, B0(SH )=9.39(3)cm 1, B0(SD-)=4.87(2)cm-1The electron affinities of SH, SD have been determined to be EA(SH)=2.317(2)eV and E A(SD) = 2.315 (2)eV; the negative ion vibrational frequencies have been found to agree with those in the parent neutrals to within about 100 cm-1

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“…If this procedure is carried out for the measured generalized oscillator strengths in the direction of the vector of the momentum transfer (binary peak) and in the opposite direction (recoil peak), then the generalized oscillator strengths for both directions reach in the limit q~0 the dipole oscillator strength multiplied with a factor 3/47:. For the normalization of the cross sections the photoabsorption data of Samson [16] have been used which are stated to be correct within _+3 %. The measured oscillator strengths as well as the extrapolated curves are shown in Fig.…”

Section: Absolute Cross Sectionsmentioning

confidence: 99%

Absolute triple differential cross sections for electron impact ionization of helium: Comparison between experimental and theoretical results at 256 eV collision energy

et al. 1985

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Triple differential cross sections have been measured for electron impact ionization of helium at 256eV collision energy, 3eV energy of the slow outgoing electrons and scattering angles of the fast outgoing electrons of 4 ~ 6 ~ 8 ~ and 10 ~ The data have been put on absolute scale by extrapolating the generalized oscillator strength to zero momentum transfer. In this optical limit the triple differential cross sections can be normalized by using the well-known cross sections for photoionization. The experimental data are compared with results of different theoretical approaches. For nearly all calculated curves rather good agreement with the measurements is obtained for the relative shape of the binary peak, while often its absolute cross section is overestimated. Concerning the recoil peak, larger discrepancies are found with respect to both, relative shapes and cross sections. A perceptible improvement can be stated for calculations which have been performed in a distorted wave approximation and in second Born approximation.

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Photoionization of atoms and molecules

Cited by 95 publications

References 234 publications

Trends in the theory of atomic photoionization

Trends in the theory of atomic photoionization

High resolution photoelectron spectrometry of negative ions: Rotational transitions in laser-photodetachment of OH?, SH?, SD?

Absolute triple differential cross sections for electron impact ionization of helium: Comparison between experimental and theoretical results at 256 eV collision energy

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