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L1 LINE WIDTHS OF THE ELEMENTS Z = 41 TO 50
P. Putila-Mäntylä, G. Graeffe
To cite this version:
P. Putila-Mäntylä, G. Graeffe. L1 LINE WIDTHS OF THE ELEMENTS Z = 41 TO 50. Journal de
Physique Colloques, 1987, 48 (C9), pp.C9-617-C9-620. �10.1051/jphyscol:19879103�. �jpa-00227210�
JOURNAL DE PHYSIQUE
Colloque C9, suppl6ment au n012, Tome 48, d6cembre 1987
L, LINE WIDTHS OF THE ELEMENTS Z = 41 TO 5 0
P. PUTILA-M~NTYLA and G. GRAEFFE
Department of Physics, Tampere University of Technology, PL 527, SF-33101 Tampere, Finland
In our previous works we have found a large discrepancy in experimental ant theoreti- val L1 line widths in elements between Z = 41 to 50. This is due to an overestimate of Coster Kronig L
-
L3M4 processes by theory. The theory predicts the closing of L1 - L3M4 chanel at Z = 58 in atoms as well as in solid state. The experimental X- ray emission results indicate that the L1 - L M CK chanel may close already at Z =4 8 . 3 4
INTRODUCTION
In our previous works 11,21 we have measured the L x-ray spectra of elements 4 1 ~ b to 5 1 ~ b and derived the L level'widths from these. We found a large discrepancy in ex- perimental and theoretical L1 line widths in all elements Z = 41 to Z = 49. The L1 level widths were derived from LB3 (L1M3) and LB4 (L1M2) x-ray emission lines by sub- tracting from the x-ray line width the corresponding M level width. The Lorentzi-
2,3
an profile was assumed for widths. There arevery little experimental results avail- able about the L1 level width in the region Z = 40 to 51. The only experimental in- formation comes from x-ray emission measurements.
The L1 transition probabilities have proved to be difficult to calculate correctly.
The theory predicts the LILSM4,5 Coster Kronig (CK) transition to account more than 60% of the total L1 widths /3/.
There are three different types of processes which can occupy the L1 hole (Fig. 1) radiative transition, Auger process and Coster Kronig (CK) transition. If CK trandi- tions are energetically allowed they tend to form a major decay channel. The radia- tive as well as Auger transition probabilities are fairly well understood and thus in regions where CK transitions are possible, XES method gives useful information of CK transitions.
C9-618 JOURNAL DE PHYSIQUE
DISCUSSION
The measured LB line widths are shown in Figures 1 and 2. To calculate the L.
level widths we have used the experimental M line width from ref. 4. The L level widths are also shown in Figs. 2 and 3. In Table I we have compared our experimental results to the theoretical values obtained in ref. 3.
In the region Z = 40 to 49 L L„M CK transitions play an important role in the de- cay process of L hole. These transitions play an important role in the L satellite spectrum as well. We have analyzed earlier the L satellite spectra between Z = 40 to 50 /5,6/. The intensity analysis showed a clear drop at Z = 50 indicating the closing of the L.L,M„ channel. No drop at Z = 48 was seen. The L line widths show
1 3 4,5 1 a drop at Z = 48. The similar kind of drop can be observed also in the work by Doyle
and Shafroth /7/ in their L satellite intensity study.
According to the theory /8,9/ L L M _ CK transitions become forbidden in solids at Z = 50. The experimental results show that something is happening already to the CK transition probability at Z = 48. One explanation could be that one of the CK chan- nels L L M becomes hindered already at Z = 48 and both channels are forbidden at Z = 50.
Table I. Experimental and theoretical L line width (in eV) of elements Z = 40 to 51.
Element
40 Zr 41 Nb 42 Mo 43 Tc 44 Rn 45 Rh 46 Pd 47 Ag 48 Cd 49 In 50 Sn 51 Sb
Experiment (a)
3.6 3.78 3.60
3.66 3.96 3.82 3.91 3.06 3.2 2.44 2.24
/l/
(b) 3.8 3.92 3.72
3.32 3.36 3.48 3.27 2.87 3.01 2.20 2.13
Theory /3/
5.91 6.08 6.20 6.43 6.63 6.75 6.77 6.82 6.87 6.92 3.00 3.12 a) from the LB, line width
b) from the LB. line width 4
Fig. 1. Three different types of processes which can fill the L1 hole; a) radiative transition (L1M3), b ) Auger transition (L M M ) , c) Coster-Kronig transi-
tion (L1L3M4). 1 2 5
40 42 44 46 48 50
Atomic Number z
Fig. 2. The experimental L e g line widths as well as from these derived L1 level
JOURNAL DE PHYSIQUE
40 42 44 46 48 50
Atomic Number z
F i g . 3. The e x p e r i m e n t a l LP4 l i n e w i d t h a s w e l l a s from t h e s e d e r i v e d L1 l e v e l w i d t h s .
REFERENCES
1. P. P u t i l a - M a n t y l a , M. Ohno and G . G r a e f f e , J . Phys. B
17
( 1 9 8 4 ) 1735.2. M. Ohno, P. P u t i l a - M a n t y l a and G. G r a e f f e , J . Phys. B
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( 1 9 8 4 ) 1747.3 . M.H. Chen, B. Crasemann a n d H. Mark, Phys.Rev. A
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( 1 9 8 1 ) 1158.4 . N . ~ Q r t e n s s o n a n d R. Nyholrn, Phys.Rev. B
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( 1 9 8 1 ) 7121.5. H . J u s l b n , M. P e s s a and G. G r a e f f e , Phys.Rev. A
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( 1 9 7 9 ) 1 9 6 .6 . P. P u t i l a , H . J u s l 6 n , M. P e s s a a n d G. G r a e f f e , P h y s i c a S c r i p t a
20
( 1 9 7 9 ) 41.7 . B.L. Doyle a n d S.M. S h a f r o t h , A b s t r a c t s o f t h e c o n t r i b u t e d p a p e r s o f Second I n t e r - n a t i o n a l C o n f e r e n c e on I n n e r S h e l l I o n i z a t i o n Phenomena, F r e i b u r g ( 1 9 7 6 ) 211.
8 . F.P. L a r k i n s , J . Phys. C 1_1 (1978) 1965.
9 . M. Ohno, J . P h y s . C
