Measurement of the L sub 2 - L sub 3 Coster-Kronig transition probability in Tm( Z =69)

Journal Article · Wed Nov 01 04:00:00 EST 1989 · Physical Review (Section) A: General Physics; (USA)

DOI:https://doi.org/10.1103/PhysRevA.40.4977· OSTI ID:5250056

Catz, A L ^[1]

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1. University of Massachusetts at Boston, Boston, Massachusetts 02125 (US)

The {ital L}{sub 2}-{ital L}{sub 3} Coster-Kronig transition probability ({ital f}{sub 23}) in Tm was measured by multiparameter {ital K} versus {ital L} x-ray coincidence techniques. The Tm x rays were obtained from a radioactive source of {sup 169}Yb and were detected with cooled germanium and silicon detectors of high-energy resolution. Corrections were applied for the contribution of {ital K}{alpha}{sub 1} x rays to the {ital K}{alpha}{sub 2} x-ray peak and for the contribution of unresolved {ital L}{eta} x rays to the {ital L}{alpha}{sub 1,2} x-ray peak. The contribution of {ital K}{alpha}{sub 1} x rays to the {ital K}{alpha}{sub 2} x-ray peak was determined solely from the results of the coincidence measurements using a method of data analysis which was previously described elsewhere. The contribution of {ital L}{eta} x rays to the {ital L}{alpha}{sub 1,2} x-ray peak was determined from the coincidence measurements and published values of the {ital L}{eta} to {ital L}{beta}{sub 1} x-ray intensity ratio. The result obtained for {ital f}{sub 23} is (13.44{plus minus}0.24){times}10{sup {minus}2} or (14.06{plus minus}0.24){times}10{sup {minus}2} depending on the value of the {ital L}{eta} to {ital L}{beta}{sub 1} intensity ratio used in applying the correction. Both values are slightly lower than predicted by the latest theoretical calculations confirming a trend of departures from theory recently observed in other medium- and high-{ital Z} atoms.

• OSTI ID: 5250056
• Journal Information: Physical Review (Section) A: General Physics; (USA), Journal Name: Physical Review (Section) A: General Physics; (USA) Vol. 40:9; ISSN PLRAA; ISSN 0556-2791
• Country of Publication: United States
• Language: English

Related Subjects

640302* -- Atomic
Molecular & Chemical Physics-- Atomic & Molecular Properties & Theory
74 ATOMIC AND MOLECULAR PHYSICS
AUGER EFFECT
COINCIDENCE METHODS
COSTER-KRONIG TRANSITIONS
COUNTING TECHNIQUES
ELECTRONIC STRUCTURE
ELEMENTS
ENERGY RESOLUTION
ENERGY-LEVEL TRANSITIONS
K SHELL
L SHELL
METALS
RARE EARTHS
RESOLUTION
SPECTRA
THULIUM
X-RAY SPECTRA