Abstract
The effects of ionizing radiations on LiF: Ni and NaF: Ni crystals have been investigated by paramagnetic resonance methods. Nickel dissolves substitutionally in LiF and NaF in the divalent state and is associated with charge compensating positive ion vacancies or vacancy aggregates. When the crystals are exposed to ionizing radiations at room temperature the Ni
2
+(3
d
8
,
3
F
) ions trapelectrons forming Ni
+
(3
d
9
,
2
D
) ions which are, in general, associated with a variety of vacancy configurations. Eight different Ni
+
complexes have been investigated in both LiF and NaF and detailed models are proposed for some of these. The annealing behaviour of the Ni
+
complexes in the room temperature and low temperature irradiated crystals is described. The symmetry of the Ni
+
complexes is less than cubic because of the Jahn -Teller effect and associated vacancies and both |x
2
— y
2
y and |3z
2
— r
2
y ground states are observed. The ground state of unassociated Ni
+
ions is |3z
2
— r
2
>. The fluorine hyperfine structure of the Ni
+
spectra has been investigated. Effects are observed in both the
g
values and the fluorine structure which are attributed to zero point vibrational admixtures of the |x
2
— y
2
> and |3z
2
— r
2
> states. The effects of the nickel impurity on
F
- and
M
- band formation in the crystals are described in an appendix.
Reference30 articles.
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3. Proc. Roy;Bleaney B.;Soc. A,1955
4. Absorption Spectra ofF2−,Cl2−,Br2−, andI2−in the Alkali Halides
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