HAL Id: jpa-00219381
https://hal.archives-ouvertes.fr/jpa-00219381
Submitted on 1 Jan 1979
HAL is a multi-disciplinary open access archive for the deposit and dissemination of sci- entific research documents, whether they are pub- lished or not. The documents may come from teaching and research institutions in France or abroad, or from public or private research centers.
L’archive ouverte pluridisciplinaire HAL, est destinée au dépôt et à la diffusion de documents scientifiques de niveau recherche, publiés ou non, émanant des établissements d’enseignement et de recherche français ou étrangers, des laboratoires publics ou privés.
SOME REGULARITIES WITHIN THE STARK WIDTHS AND SHIFTS OF RESONANCE LINES OF
NEUTRAL ATOMS FROM He TO Ca
J. Purik, I. Lakikevik, V. Glavonjik
To cite this version:
J. Purik, I. Lakikevik, V. Glavonjik. SOME REGULARITIES WITHIN THE STARK WIDTHS AND
SHIFTS OF RESONANCE LINES OF NEUTRAL ATOMS FROM He TO Ca. Journal de Physique
Colloques, 1979, 40 (C7), pp.C7-795-C7-796. �10.1051/jphyscol:19797383�. �jpa-00219381�
JOURNAL DE PHYSIQUE Colloque C7, suppl6ment au n07, Tome 40, JuiZZet 1979, page C7- 795
SOME REGULARITIES WITHIN THE STARK WIDTHS AND SHIFTS OF RESONANCE
LINES OF NEUTRAL ATOMS FROM He TO Ca
J. ~uriC', I. ~ a k i d e v i f ' and V. ~ l a v o n j i d .
Faculty of Natural and Mathematical Sciences, Department o f Physics and Meteorology and I n s t i t u t e o f
*Physics, P.O. Box 550, Beograd, Yugoslavia.
I n s t i t u t e o f Physics, P.O. Box 57, Beopad, Yugoslavia.
Papers published by P u r i d e t a 1 . / 1 , 2 / w i d t h s and s h i f t s v a l u e s along t h e p e r i o d i c and r e c e n t l y by A.14azure and G.iJollez /3/ system of elements, s i m i l a r t o t h e p e r i o d i - have i n i t i a t e d i n t e r e s t t o f i n d p o s s i b l e c a l dependence of i o n i z a t i o n p o t e n t i a l of r e g u l a r i t i e s i n S t a r k broadening and s h i f t n u c l e a r c h a r g e number Z , i s obvious.
parameters of resonance l i n e s of d i f f e r e n t groups of elements. I n t h e p a 2 e r s / 1 , 2 / re-.
g u l a r i t i e s of S t a r k widths of t h e resonance l i n e s of a l k a l i - m e t a l s and a l k a l i - m e t a l s and a l k a l i - l i k e atoms and i o n s have Seen
r e p o r t e d and d i s c u s s e d . I n t h e r e c e n t l y published paper/3/ t h e l i n e a r dependence of S t a r k w i d t h s and s h i f t s o f n e u t r a l r e - sonance l i n e s of a l k a l i - m e t a l s on atomic parameter
1 X I
2/3 and1 X I
2 / 3 signX r e s p e c t i - v e l y , h a s p o i n t e d o u t , where X i s atomic p o l a r i s a b i l i t y .I n t h i s paper t h e e x i s t e n c e of c e r t a i n r e g u l a r i t i e s i n S t a r k widths and s h i f t s va- l u e s of resonance l i n e s of n e u t r a l atoms from H e t o Ca a v a i l a b l e i n l i t e r a t u r e have been p r e s e n t e d and d i s c u s s e d . Namely, it has been found t h a t t h e l i n e a r dependence of w and d v a l u e s on
1x1
2 / 3 f o r a l l r e s o - nance s p e c t r a l l i n e s of n e u t r a l atoms from He t o Ca e x i s t s . Also, t h e p e r i o d i c a l de- pendence of w and d v a l u e s on atomic num- b e r Z h a s been n o t i c e d and d i s c u s s e d .I n Fig. 1 a p l o t of t h e o r e t i c a l / 4 / widths ( a ) and s h i f t s ( b ) , and i o n i z a t i o n p o t e n t i a l s I a g a i n s t t h e corresponding nu- c l e a r c h a r g e number Z i s g i v e n f o r n e u t r a l atom l i n e s from H e t o Ca. The widths and s h i f t s have been p l o t t e d f o r f o u r e l e c t r o n t e ~ p e r a t u r e s and e l e c t r o n d e n s i t y N=10 17
Analysing t h i s f i g u r e one can conclu- d e t h a t a p e r i o d i c a l behaviour of S t a r k
Article published online by EDP Sciences and available at http://dx.doi.org/10.1051/jphyscol:19797383
Furthermore, one can see that Stark widths for B, C, N, 0, Ne, Al, Si, S, c1 and A li- and shifts curves have maxima for the ele-
ments with the lowest ionization potential.
The minima correspond to elements with the highest ionization potential. This can be expected due to the fact that the energy gap.between the nearest perturbing level and upper level of the corresponding reso- nance line is proportional to ionization potential of 'the emitter.
Fig. 20.
0 Griem (1974)
V Moo-Young et a1.(1970)
a Morris e t a1.(1969) H. Nubbemeyer and B. Wende (1977)
5 10 15
Fig, 2.b.
np
-
n'so Griem (1974)
In Fig. 2. a and b, an example of li- near dependence of w and d theoretical /4/
values on
1 X I
2/3 and1 XI 2/3 signx respecti- vely, are presented for N = 1017 cme3 and T = 2.10 4 K. It has been found that the slope of linear trend is different for re- sonances originating from two types of transitions: ns-n'p and np-nrs. Namely, there is one slope for He, Li, Be,, Na and Ng lines (ns-n'p transition) and the other
nes (np-nr s transition)
.
Theoretical and experimental w and d values are presented in Fig. 2. for the sake of comparison, but unfort~nately~they are for different temperatures. Regardeles of that, experimental data follow the li- near trends within k e estimated errors
(+20%).
Analysing results presented in figures 1. and 2. one can draw following conclu- sions :
a) Periodical dependence of Stark width and shift values of resonance spectral li- nes on nuclear charge number Z is universal and fundamental similar to the periodical dependence of ionization potential on 2.
b) As it seems that the linear depenuen- ce of w and d values on
1x1
2/3 andI XI
2/3signX respectively, is valid, it may be used, firstly, to estimate the Stark widths and shifts of heavier elements lines not available so far, and secondly, as a crite- rion for validity of experimentally obtai- ned data.
R e f e r e n c e s
1. J.Puri6, J.Labat, ~j.eirkovid, 1.Laki- devid and S.Djenize, J.Phys. B, 10, 2375 (1977)
2. J.Purib, M.S.Dimitrijevi6 and 1.S.Laki- devib, Phys.Lett. A, 67, 189 (1978) 3. A.Mazure and G.Nollez, Z. Nat.33a (1978) 4. H.X.Griem, "Spectral 'Line Broadening by
Plasmas", New York and London Acad.
Press (1974)
5. N-Konjevid and J.Roberts, J. of Phys.
and Chem. Data, 5, 209 (1976)
6. H.Nubbemeyer and B.Wende, Phys. Rev. A, 16, No. 2, 627 (1977).
