Penning ionization and photoionization electron spectrometry of hydrogen bromide

Yencha, Andrew J.; Ruf, M.-W.; Hotop, H.

doi:10.1007/bf01425590

Cited by 32 publications

(68 citation statements)

References 48 publications

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“…Nevertheless, the less pronounced vibrational structure of higher vibrational levels of the observed spectrum indicates the influence of predissociation processes for these vibrational levels of the A2N + ionic state as discussed by several authors [10,[26][27][28][29][30][31][32].…”

Section: P±(o) ()mentioning

confidence: 91%

“…This changes the dissociation energy and the equilibrium bond length only very slightly whereas photoionization of a po--electron leads to the first excited A2X + state of the HBr ion with an increase of the equilibrium bond length of the ion [25]. Consequently, as a result of the Franck-Condon principle, for photon energies above the HBr ÷ A2X + excited state only the components (v = 0) of the HBr ÷ X2H3/2 and X2111/2 states are intense [26,27] while for the HBr ÷ A2X ÷ state higher vibrational levels appear in the photoelectron spectra [26,27]. Photoelectrons corresponding to the HBr + X2113/2(v = 1) and X2IIl/2(v = 0) final ionic states have nearly the same kinetic energy and could not be separated [28].…”

Section: General Description Of the Photoionization Relations Of Hbrmentioning

confidence: 93%

“…Photoelectrons corresponding to the HBr + X2113/2(v = 1) and X2IIl/2(v = 0) final ionic states have nearly the same kinetic energy and could not be separated [28]. For vibrational levels higher than (v = 3) the vibrational pattern of the photoelectron spectra of the A2X + state for HBr ÷ is perturbed by predissociation [26]. Above the 211 thresholds of the ion, Rydberg series converging to the excited A2X + state dominate the photoionization process giving rise to electronic autoionization and predissociation [10,11].…”

Section: General Description Of the Photoionization Relations Of Hbrmentioning

confidence: 96%

“…Comparisons of the spin polarization data for region (I) of HBr (dominated by resonances with a (4pro) 3 2H1/2 ionic core) and for the results for the corresponding nd(r~, 6) spin-orbit Rydberg states of HI [13] (with a (5Uc) 3 2111/2 ionic core), obtained with high energy resolution produced by frequency-converted laser radiation, indicate a similar behavior of the photoionization parameters in this energy region with A values ranging from 0.06 to 0.1,, values from 0.15 to 0.21 and values close to zero. In the energy region of electronic autoionization (II) the dynamical photoionization parameters reveal pronounced resonance structures induced by vibrational series of Rydberg states converging to the A2S + and to the repulsive a4H ionic states [10,26] leading to an oscillatory pattern of the cross section [10,11,29,32]. The remarkable decrease of the parameters A and ~ to small values in the photon energy region of the partially dissociated 4da 1S+ resonances between the 5p(a, ~) ~H and the 5d~z ~1I Rydberg states, with values close to zero at the threshold of the 4drc 1H Rydberg state at Ephoton = 13.43eV, illustrates the strong influence of autoionization and predissociation on the photoionization process [10,11,29].…”

Section: P±(o) ()mentioning

confidence: 99%

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Angle- and spin-resolved photoelectron spectroscopy of thepπ outer valence shell of HBr molecules

Salzmann

Böwering

Klausing

et al. 1996

Z Phys D - Atoms, Molecules and Clusters

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Abstract. Using circularly polarized synchrotron radiation, the photoionization of HBr molecules was studied by angle-and spin-resolved photoelectron spectroscopy in the photon energy range from ll.7eV to 21eV. For photoelectrons corresponding to the final ionic states HBr + X2H3/2(v = O) and X2//1/2 (v = 0), the energy dependence of the dynamical photoionization parameters was measured and compared with ab initio calculations for HBr + by Raseev et al. and RRPA calculations for Kr ÷ by Huang et al.. This comparison indicates that, for energies above the electronic autoionization region, photoemission from the outer valence orbital exhibits distinct atomic behavior. By combining the experimental data for the cross section a and the spin polarization parameter A, sums of partial cross section contributions to a were determined and analyzed to obtain specific information on the outgoing partial electron waves. Furthermore, the validity of the so-called non-relativistic relationships for the dynamical photoionization parameters was tested as a function of equal photon and kinetic photoelectron energy, respectively.

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Section: P±(o) ()mentioning

confidence: 91%

Section: General Description Of the Photoionization Relations Of Hbrmentioning

confidence: 93%

Section: General Description Of the Photoionization Relations Of Hbrmentioning

confidence: 96%

Section: P±(o) ()mentioning

confidence: 99%

See 2 more Smart Citations

Angle- and spin-resolved photoelectron spectroscopy of thepπ outer valence shell of HBr molecules

Salzmann

Böwering

Klausing

et al. 1996

Z Phys D - Atoms, Molecules and Clusters

View full text Add to dashboard Cite

show abstract

“…The experimental apparatus and the procedure for taking electron spectra with different excitation sources has been described in detail previously [31,32], so only a brief overview will be given here. The apparatus consisted of two differentially-pumped chambers with base pressures of < 2.10 .7 Torr, each evacuated by a separate 5001 s-1 turbomolecular pump.…”

Section: Methodsmentioning

confidence: 99%

Penning ionization and photoionization electron spectrometry of hydrogen fluoride

Yencha

Ruf

Hotop

1993

Z Phys D - Atoms, Molecules and Clusters

Self Cite

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Abstract. An electron spectrometric study has been performed on HF using metastable helium and neon atoms as well as helium and neon resonance photons. High-resolution electron spectra were obtained for a pure He(23S) beam, a mixed He(21S, 23S) beam, a mixed Ne(3s, 3P2, 3Po) beam, and for HeI and NeI VUV light. From the comparison of vibrational populations of HF + (X 2H~, v') and HF+(A 2S+, v') produced by He(23S) metastables and HeI resonance photons, we conclude that there is only a slight perturbation of the HF(X ~S +) potential in He (23S) Penning ionization; no perturbation is found for HF+(X 2/~., v') formation from Ne(3P2,0) metastable ionization of HF. For He (21S) + HF the X-and A-ionic state vibrational peak shapes are substantially broader than in the He(23S)+HF case pointing to an additional, charge exchanged interaction (He + + H F ) in the entrance channel of the former system. The vibrational population found for NeI~ photoionization of HF for formation of HF + (X 2~, v') is found to differ considerably from that for NeIp photoionization and from the Franck-Condon factors for unperturbed HF(X 1X+) and HF + (X 2Hi) potentials suggesting the presence of an autoionizing superexcited state of HF in the energy vicinity of the NeI~ resonance photons. The HF+(X) 2H3/2: 2H1/2 fine-structure branching ratios vary significantly with the ionizing agent in a similar way as previously found in HC1 and HBr.

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Stereo-Dynamics of Autoionization Reactions Induced by Ne*(3P0,2) Metastable Atoms with HCl and HBr Molecules: Experimental and Theoretical Study of the Reactivity Through Selective Collisional Angular Cones

Parriani

Vecchiocattivi

Pirani

et al. 2022

Computational Science and Its Applications – ICCSA 2022 Workshops

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Penning ionization and photoionization electron spectrometry of hydrogen bromide

Cited by 32 publications

References 48 publications

Angle- and spin-resolved photoelectron spectroscopy of thepπ outer valence shell of HBr molecules

Angle- and spin-resolved photoelectron spectroscopy of thepπ outer valence shell of HBr molecules

Penning ionization and photoionization electron spectrometry of hydrogen fluoride

Stereo-Dynamics of Autoionization Reactions Induced by Ne*(3P0,2) Metastable Atoms with HCl and HBr Molecules: Experimental and Theoretical Study of the Reactivity Through Selective Collisional Angular Cones

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