Isotope splitting of the F-center in-gap mode in KI and KBr

被引:23
作者
Baeuerle, D. [1 ]
Huebner, R.
机构
[1] Cornell Univ, Atom & Solid State Phys Lab, Ithaca, NY 14850 USA
[2] Univ Stuttgart, Inst Theoret Phys, D-7000 Stuttgart, Germany
[3] Univ Stuttgart, Inst Phys 2, D-7000 Stuttgart, Germany
来源
PHYSICAL REVIEW B-SOLID STATE | 1970年 / 2卷 / 10期
关键词
D O I
10.1103/PhysRevB.2.4252
中图分类号
O469 [凝聚态物理学];
学科分类号
070205 ;
摘要
High-resolution measurements at the F-center in-gap mode in KI and KBr have revealed a threefold structure in the absorption spectrum with lines at 82.62 +/- 0.02, 81.98 +/- 0.02, 81.19 +/- 0.05 cm(-1) and at 99.60 +/- 0.03, 99.07 +/- 0.04, 98.50 +/- 0.05 cm(-1), respectively. This structure Is interpreted as due to the presence of two stable isotopes, K-39 and K-41, in the crystal. In a three-dimensional-model calculation which uses as parameters changes in the force constants between the defect and the first nearest neighbors (A01) and changes in the force constant between the first and fourth nearest neighbors (A14), we found that the in-gap mode frequencies are extremely sensitive to the value of the latter. The position and splitting in the absorption lines can be explained in the calculation by using A01 = -0.50, A14 = -0.060 for KI and A01 = -0.50, A14 = + 0.002 for KBr. Stress experiments on the strongest lines in KI are in agreement with our model. Extending the calculation to Cl- and Br- centers in KI, it is shown that the measured isotope splitting for Cl-35, Cl-37 and Br-79, Br-81 centers can be explained by taking into account not only changes in A01 but also changes in A14.
引用
收藏
页码:4252 / 4262
页数:11
相关论文
共 25 条
[1]   FAR INFRARED ABSORPTION DUE TO U-CENTERS AND F-CENTERS IN KI [J].
BAUERLE, D ;
FRITZ, B .
SOLID STATE COMMUNICATIONS, 1968, 6 (07) :453-&
[2]   VIBRATIONAL SPECTRA OF U1-CENTRES IN KI [J].
BAUERLE, D ;
FRITZ, B .
PHYSICA STATUS SOLIDI, 1968, 29 (02) :639-&
[3]   LATTICE RESPONSE FUNCTIONS OF IMPERFECT CRYSTALS - EFFECTS DUE TO A LOCAL CHANGE OF MASS AND SHORT-RANGE INTERACTION [J].
BENEDEK, G ;
NARDELLI, GF .
PHYSICAL REVIEW, 1967, 155 (03) :1004-&
[4]   OPTICAL RESPONSE FUNCTIONS OF F-CENTER [J].
BENEDEK, G ;
MULAZZI, E .
PHYSICAL REVIEW, 1969, 179 (03) :906-&
[5]   LATTICE DYNAMICS OF ALKALI HALIDE CRYSTALS .3. THEORETICAL [J].
COWLEY, RA ;
BROCKHOUSE, BN ;
WOODS, ADB ;
COCHRAN, W .
PHYSICAL REVIEW, 1963, 131 (03) :1030-&
[6]   NORMAL VIBRATIONS OF POTASSIUM IODIDE [J].
DOLLING, G ;
COWLEY, RA ;
SCHITTENHELM, C ;
THORSON, IM .
PHYSICAL REVIEW, 1966, 147 (02) :577-+
[7]   NEAR AND FAR INFRARED VIBRATIONAL ABSORPTION OF H-/1 AND D-/1 CENTRES IN KBR [J].
DURR, U .
ZEITSCHRIFT FUR PHYSIK, 1970, 233 (01) :94-&
[8]  
ESHELBY JD, 1956, SOLID STATE PHYS, V3, P79
[9]   SHIFT AND SPLITTING OF F-ABSORPTION BAND IN ALKALI HALIDE CRYSTALS BY APPLICATION OF UNIAXIAL PRESSURE [J].
GEBHARDT, W ;
MAIER, K .
PHYSICA STATUS SOLIDI, 1965, 8 (01) :303-&
[10]  
GENZEL L, UNPUB