$L_{2} - L_{3} N$ Coster-Kronig Transition Probabilities and $L$ -Subshell Fluorescence Yields of Hg and Ta

The probability for the radiationless transfer of

L_{2}

vacancies to the

L_{3}

subshells of Hg and Ta has been measured directly, by observing the spectra of

L

x rays from

{Tl}^{204}

and

W^{181}

in coincidence with

K_{α_{2}}

x rays. The

L_{α}

component of the coincident spectrum provides a measure of the

L_{2} - L_{3} N

Coster-Kronig transition probability,

L_{2} - L_{3} M

transitions being energetically impossible in this region. The following values are found: for Hg,

f_{L_{2} L_{3}} = 0.08 \pm 0.02

; for Ta,

f_{L_{2} L_{3}} = 0.20 \pm 0.04

. The x-ray coincidence experiments show that the average number of x-ray quanta emitted after creation of a primary vacancy in the

L_{2}

subshell is

ν_{L_{2}} = 0.42 \pm 0.02

for Hg and

ν_{L_{2}} = 0.31 \pm 0.01

for Ta. Subshell fluorescence yields are found to be

ω_{L_{2}} = 0.39 \pm 0.03

and

ω_{L_{3}} = 0.40 \pm 0.02

for Hg;

ω_{L_{2}} = 0.25 \pm 0.02

and

ω_{L_{3}} = 0.27 \pm 0.01

for Ta.

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L2−L3NCoster-Kronig Transition Probabilities andL-Subshell Fluorescence Yields of Hg and Ta