Journal or Book Title
Physical Review Letters
The shifts of the first two exciton peaks with hydrostatic pressure have been measured in CsI films at 78°K and found to be linear. The deformation potentials deduced are -2.10 eV and +2.10 eV, respectively. These results confirm Onodera's assignment of the two peaks to excitons derived from bands of different symmetry. The data indicate that above 7 kbar the conduction bands cross and the Γ12 level lies below the Γ1 (Onodera's assignment).
The American Physical Society
Lynch, David W. and Brothers, A. D., "Deformation Potentials for Excitons in CsI" (1968). Physics and Astronomy Publications. 14.