A new angle-resolving photoelectron spectrometer for photoionisation studies of free atoms and molecules using synchrotron radiation

• Published in: Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment Vol. 308; no. 3; pp. 621 - 634
• Main Authors: Kreile, J., Kurland, H.-D., Seibel, W., Schweig, A.
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 20.10.1991
• ISSN: 0168-9002; 1872-9576
• DOI: 10.1016/0168-9002(91)90076-3

A newly constructed angle-resolving photoelectron spectrometer and an appropriate computer-based spectrometer control and data-acquisition system, both specifically designed for photoionisation studies of free atoms and molecules using monochromatised synchrotron radiation from the electron storage ring BESSY, are described. Details of an experimental procedure for the determination of high-precision photoelectron angular-distribution parameters β are specified. To illustrate the performance of the described apparatus and procedure, β values for the Kr + (4p) −1 spin—orbit components 2 P 3 2 and 2 P 1 2 , measured using synchrotron radiation in the photon energy range 15–24.8 eV, are presented and compared with available experimental and theoretical literature data. The uncertainties of the reported angular-distribution parameters are considerably smaller than those of earlier data. Hence the angular-distribution parameters of the present study can be very useful for future accurate polarisation determinations of monochromatised synchrotron radiation and for calibration procedures of other angle-resolving photoelectron spectrometers.