Two spectrometers for threshold photoelectron coincidence studies of double photoionization

1996 ◽  
Vol 74 (11-12) ◽  
pp. 856-860 ◽  
Author(s):  
M. Hochlaf ◽  
H. Kjeldsen ◽  
F. Penent ◽  
R. I. Hall ◽  
P. Lablanquie ◽  
...  
Keyword(s):  
Time Of Flight ◽  
Double Ionization ◽  
Coincidence Measurement ◽  
Ionization Threshold ◽  
Zero Energy ◽  
Field Technique ◽  
Double Photoionization

We present here two simple instruments for the study of double photoionization processes at threshold. They rely on the coincidence measurement of two near-zero energy electrons, which are collected by a penetrating field technique, and energy selected either by time-of-flight analysis (1st setup) or by electrostatic filtering in a hemispherical analyzer (2nd setup). Performance of the apparatus is demonstrated on Ar threshold double photoionization, and used to show the importance of two step double photoionization routes at Ar and Kr double ionization threshold.

Delayed Field Transient Photocurrent Measurements in a-Si:H

1992 ◽  
Vol 258 ◽  
Author(s):  
Homer Antoniadis ◽  
E. A. Schiff
Keyword(s):  
Applied Voltage ◽  
Delay Time ◽  
Deep Level ◽  
Time Of Flight ◽  
Laser Flash ◽  
Field Technique ◽  
Transient Photocurrent

ABSTRACTWe have measured the transient photocurrent in “time-of-flight” structures of a-Si:H using bias voltages applied following photocarrier generation by a laser flash. The delayed field technique appears promising both as a probe of the deep level distribution and also of photocarrier thermalization. We describe a simplified theory for the delayed field transients including the effects of the delay time and the magnitude of the applied voltage. The theory accounts for the measurements adequately.

Photoionization phenomena near the double-ionization threshold of helium

1991 ◽  
Vol 24 (1) ◽  
pp. 115-125 ◽  
Author(s):  
R I Hall ◽  
L Avaldi ◽  
G Dawber ◽  
M Zubek ◽  
K Ellis ◽  
...  
Keyword(s):  
Double Ionization ◽  
Ionization Threshold

Double photoionization of below the double ionization potential

1997 ◽  
Vol 30 (9) ◽  
pp. 2177-2186 ◽  
Author(s):  
J H D Eland ◽  
P Lablanquie ◽  
M Lavollée ◽  
M Simon ◽  
R I Hall ◽  
...  
Keyword(s):  
Ionization Potential ◽  
Double Ionization ◽  
Double Photoionization

Interchannel interactions and series quenching in the 5d and 6s spectra of Pb I

1977 ◽  
Vol 357 (1691) ◽  
pp. 499-512 ◽  
Keyword(s):  
Absorption Spectrum ◽  
Double Ionization ◽  
Low Energy ◽  
Ionization Threshold ◽  
In Series ◽  
Channel Interactions ◽  
Spectator Model

The absorption spectrum of lead vapour in the range 320-1070 A has been obtained. More than 60 transitions have been, found, mostly arrangable in series, which are due to excitation of either a 5d or 6s electron. Pronounced inter-channel interactions occur, similar to those in the corresponding spectrum of Tl I. Our observations confirm the applicability of a ‘ spectator model ’ for 6s excitation. The comparatively low energy of the double ionization threshold results in quenching of all but one 5d excitation series.

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