Photoelectron asymmetry parameters of Ar, Kr, Xe, H2, N2, O2, CO and CO2: New measurements and a reconsideration of literature data

Kreile, Jürgen; Schweig, Armin

doi:10.1016/0368-2048(80)85016-x

Cited by 83 publications

(17 citation statements)

References 42 publications

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“…Particularly for the A 'nu band the present values agree excellently with those of Mintz and Kuppermann (1978) and Kreile and Schweig (1980). The variation in the angular distribution for different U' of this band was first observed by Carlson (197 1).…”

Section: Results Obtained For Iv2 Moleculessupporting

confidence: 76%

A capillary discharge tube for the production of intense VUV resonance radiation

Schönhense

Heinzmann

1983

J. Phys. E: Sci. Instrum.

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Abstract. Design and operational characteristics of a line source with very high intensity in the vacuum u v are described. The source generates rare-gas resonance radiation in a lowpressure. cold-cathode, DC glow discharge up to 200 mA. The windowless lamp is differentially pumped and can be installed inside a vacuum chamber. During operation it is water cooled and can be mildly baked because it contains metal seals only. In a light beam of 2.5 mm diameter the photon flux for the strongest He1 and Ne1 emission line has been measured to be nearly I O L 3 s -' and one order of magnitude less for the strongest HeII, Ne11 and ArI lines. The photon intensities obtained are compared with values from the literature. The lamp has been used to investigate atomic and molecular photoionisation simultaneously resolved with respect to photon and electron energy. electron emission angle, and spin. To show the performance. angular-distribution results of photoelectron intensities for nitrogen molecules (X2C:. A211u, B'C:) at 58.43 nm are presented.

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Section: Results Obtained For Iv2 Moleculessupporting

confidence: 76%

A capillary discharge tube for the production of intense VUV resonance radiation

Schönhense

Heinzmann

1983

J. Phys. E: Sci. Instrum.

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“…For this purpose, we measured repeatedly 58.4nm photoelectron spectra of N2, CO, and 0 2 and related the respective peak areas to relative intensities in "standard" spectra, valid for our electron detection angle of 90 ~ . The 90 ~ standard spectra were calculated from the calibration data due to Gardner and Samson [39] after correcting these for angular distribution effects such that intensities relevant for 90 ~ resulted on the basis of known anisotropy parameters: [40,41]. In the appendix, we give a list of the 90 ~ standard intensities, as used for calibration in this and other work [25,36,38].…”

Section: Introductionmentioning

confidence: 99%

Ionization of hydrogen and deuterium atoms in thermal energy collisions with state-selected Ne(3s 3 P 2,3 P 0) metastable atoms

et al. 1983

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High resolution energy spectra of electrons and ions resulting from thermal energy collisions of hydrogen and deuterium atoms with state-selected metastable Ne(3s3P2, 3P0) atoms are reported. The electron spectra for Ne(3P2)+H(D) are very broad: The high energy part due to formation of Nell § (NeD +) bound states (associative ionization), amounts to about 30 % of the ionizing events, whereas the dominant part of the spectrum including a prominent low-energy peak is due to Penning ionization out of a strongly-attractive entrance potential curve. Comparison of the spectra with quantum mechanical fit calculations yields fairly accurate information on this potential, in particular its well depth De[Ne(3p2)-H,D]=2.0(1)eV. The spectra for Ne(3Po)+H,D are comparatively narrow with much lower cross sections than the one for the Ne(3P2) state. The corresponding entrance channel is a weakly bound van der Waals molecule with a well depth below 0.1eV. A perturbation calculation of the Ne(3s)+H(ls) potential energy curves at large distances explains the observed difference between the Ne(3P2)+ H(D) and Ne(3P0)+H(D) systems. Symmetry arguments are given that the major contribution to the Ne(3P2)+H(D) spectra is due to the 22; potential.

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“…Excellent data exist for the asymmetry parameter fl, which has been measured at resonance wavelengths of discharge sources [25,[98][99][100][101][102][103][104][105][106][107] as well as with synchrotron radiation [87-89, 108, 109]. In addition to the spin-parameters A, e and ~ measured with circularly polarized synchrotron radiation, 4-values from experiments with unpolarized line radiation [23,26] were used (at the HeI (21.22eV) and NeIb (16.85 eV) resonance lines).…”

Section: Determination Of Transition Matrix Elementsmentioning

confidence: 99%

Experimental characterization of the Xe 5p photoionization by angle- and spin-resolved photoelectron spectroscopy

Heckenkamp

Schäfers

Schönhense

et al. 1986

Z Phys D - Atoms, Molecules and Clusters

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Spin-and angle-resolved photoelectron spectroscopy with elliptically polarized radiation has been used to fully characterize the dynamics of photoelectron emission from free Xe atoms in the 5p-autoionization and continuum region. An advantageous reaction geometry and its experimental realization at the storage ring BESSY are discussed. The three independent experimental parameters which characterize the angular dependence of the photoelectron spin-polarization vector are reported for the wavelength range from i00nm to 40nm. The results are compared with theoretical predictions based on RRPA-, RPAE-and semiempirical MQDT-calculations. The combination of existing data for the differential photoionization cross section with the spinpolarization parameters is used to completely decouple the photoionization channels: The transition matrix elements and their relative phases are determined separately for every single dissociation channel. The results are discussed in the context of the MQDT. Correlation effects and the influence of spin-orbit interaction on the continuum states most clearly show up when the Dill-Fano angular-momentum-transfer formalism is applied.

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Photoelectron asymmetry parameters of Ar, Kr, Xe, H2, N2, O2, CO and CO2: New measurements and a reconsideration of literature data

Cited by 83 publications

References 42 publications

A capillary discharge tube for the production of intense VUV resonance radiation

A capillary discharge tube for the production of intense VUV resonance radiation

Ionization of hydrogen and deuterium atoms in thermal energy collisions with state-selected Ne(3s 3 P 2,3 P 0) metastable atoms

Experimental characterization of the Xe 5p photoionization by angle- and spin-resolved photoelectron spectroscopy

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