Grazing-incidence spectrometer and low inductance spark source used to study lines of high degrees of ionization of Sc, Ti, and 

Cohen, L.

Feldman, U.

English

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IDENTIFIED LINES 5 NEWLY 
i, IN THE' 
&Ne$ ISOELECTRONIC SEQUENCES 
a 
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BY 
k U. FELDMAN - ~ t  
1. COHEN 
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37 ; 
(CATEGORY) 
cl  FEBRUARY 1867 
GODDARD SPACE FLIGHT CENTER 
GREENBELT, MARYLAND / - .  
I ',,. " 
https://ntrs.nasa.gov/search.jsp?R=19670012751 2020-03-24T01:06:59+00:00Z
NEWLY IDENTIFIED LINES IN THE Ne I ISOELECTRONIC SEQUENCES 
U. Feldman* and L. Cohen 
Goddard Space Flight Center 
Greenbelt, Maryland 
ABSTRACT 
Using a grazing-incidence spectrometer and a low 
inductance, 14pF, 12-17 Wf, spark source, the authors 
have observed spectra of Sc x i i ,  Ti xiii, and V xiv. 
The lines have been identified as arising from transitions 
between the ground level 2 s 2 2 p 6  IS,, and the following 
electronic configurations: 2s 2p6 3p, and 2s 2p 4s, 4d, 
5d. The transitions of the type 2 s 2  2p6 - 2 s 2  21.5 4d have 
been observed also in Co xviii Ni xix and Cu xx. 
*NASA-National Academy of Science - National Research 
Council Postdoctorial Research Associate, 
It is generally evident on coilsidering an isoelectronic 
sequence of ions that. L S  one proceeds to higher degrees of 
ionization the number of known levels decreases. one of 
the important reasons for this situation, especially for the 
I .  
. *  
very high degrees of ionization (above the loth, say), is 
the lack of a suitable source for generating the spectra with 
reasonable intensity. In the Ne I isoelectronic sequence 
energy levels have been identified as far as Zn xxi. Edl.411 
and Tyrdn (1936) treated the following ions: K ix, Ca xi, 
Sc x ~ i ,  Ti xiii, and V xiv. The spectra of Cr xv, Mn xv1, 
Fe xvii, and Co xviii were reported by Tyrgn (1938). Fawcett 
(1965) measured some levels of Sc xii, Ti xiii and V xiv, 
Feldman, Cohen, and Swartz (1967) extended the isoelectronic 
sequence ,to Ni xix, Cu xx, and Zn MI. Until recently, 
a noticeable gap in the Ne I isoelectronic sequence existed 
for the spectra of SC xii, Ti xiii, and v  xi^ where only the 
following levels had been identifiea: 2 s 2  2 p h  I S o ,  
2s' 2p 3s 3p" Lp" and 2s' 2p5 3d 'P;, 'I);, 1 p, (the 
1 '  1 '  
2 s 2  2p5 3d 3P0 level in V xiv not being known). For ions 1 
below Sc xii, and above V xiv, the number of known levels 
is usually greater. This gap was probably due to the fact 
that the experimental methods by which the SC, Ti and V ions 
were first investigated (Edlgn and vr&n, 1936) were inadequate 
t o  obtain high intensities in this region. 
* .  
Therefore, o d y  
- 2 -  
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the most intense lines were observed. Later when Tyrgn 
(1938) treated the ions from Cr xv to Co xviii with improved 
methods and identified a greater number of energy levels, 
he did not return to the Sc, Ti and V ions. 
Fawcett (1965) ,  using a two-meter grazing incidence 
spectrometer and a 600 lines per mm Bausch and Loib blazed 
replica grating, with a 1/2r~.F, 90 kv vacuum spark source, 
recorded lines of Sc, Ti and V. He classified three lines 
each of sc xi1 and Ti x i i i ,  and four lines of V xiv belonging 
to transitions from the following configurations: 
and 2p6-2p5 4d. 
classified as follows: 2p 6-2p5 3d. His wavelength measurements 
are reported to an accuracy of 10.028. 
2p6-2s 2p6 3p 
He also reports an additional line in V xiv 
Independently, we recorded spectra in this region by 
using a modified Jarrell-Ash 3-meter grazing-incidence spectrometer, 
with a Bausch and Lomb 1200 lines per mm blazed gold replica. 
Our source was a 14pF, 12 to 17 kv, low-inductance condensed 
spark. A s  reference for wavelength calibration we used 
carbon and oxygen lines, and known lines of the same element 
isoelectronic with Ne I (Moore, 1949,, 1952). We have observed 
spectra of Sc xii, V xiii, Ti xiv, Co xviii, Ni xix and Cu xx. 
A s  well as the lines arising from transitions between the 
2s ' 2ph and 2s 2p 3 s ,  3d electronic configurations, the 
lines arising from transitions between the following configuracions 
- 3 -  
were recorded f o r  SC xii, V xviii and T i  x1v: 
2s2  2p6-2s 2p6 3 p ,  and 2 s 2  2p6 -2s2 Zp5 4 s ,  4d, 5d. 
wavelengths, ene rg ie s ,  and v i sua1 . l~  e s t i m a t e  I intensities 
are summarized i n  Table 1. 
The l i n e  belonging t o  2 2  
i s  a l s o  included. The wavelengths i n  Table 1 were nleasured 
t o  an  accuracy of better then  k0,005A. For  C o  xviii Ni xix 
and Cu xx t r a n s i t i o n s  of t h e  type 2 s 2  2p 6-2s 
been measured t o  an accuracy of *O.OlA. 
ene rg ie s  are i n  Table 3. 
ACKNOWLEDGEMENT 
The 
T e r m  values  are given i n  T a b l e  2. 
2ph 'So - 2 s 2  2p5 3d 3P'l) i n  V X I V  
2p 4d have 
The wavelengths and 
The  au thors  are g r a t e f u l  f o r  t h e  t e c h n i c a l  a s s i s t a n c e  
provided by M r .  Wm. Booth i n  record ing  t h e s e  s p e c t r a .  
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REFERENCES 
t EdlAn, B., and Tyren, F. 1936 Zs. f. Phys. , - 101, 206. 
Fawcett, B. C., 1965 Proc. S O C .  86, 1087. 
I
Feldman, U. Cohen, L., and Swartz, M., 1967 Ap. J., to be 
published. 
Moore, C. E . ,  1949 llAtomic Energy Levelst1 V o l .  Ill, N.B.S. 
Circular 407. (Washington; National Bureau of Standards) 
- , 1952 lIAtomic Energy Levels V o l .  11" N.B.S. Circular 407 
--<Washington; National Bureau of Standards) 
t 
Tyren, F. 1938 Zs. f. phys., -- 111, 314 
- 8 -  


Newly identified lines in NeI isoelectronic sequences

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