Abstract
The emission spectra from NaI(T1) excited by X-Rays at the temperature of liquid hydrogen showed the peaks at approximately 616, 546, 437, 379, 332, 299 and 285 m µ. The 332 m µ band is predominant at only the temperatures of liquid hydrogen and liquid helium, and is thought to arise from the T1 dimers, consisting of a pair of T1 + ions substitutionally displacing two alkali ions in the nearest neighbour (<110> direction). T1 dimer becomes an effective luminescent emission center at very low temperature. The emission spectra from CsI(T1) excited by X-rays at the temperature of liquid helium showed a superposition of 595, 537 and 474 m µ bands. The luminescence being weaker at lower temperature than at the room temperature, it shows no band in the ultraviolet region. In the following, temperature dependence of emission spectra from NaI(T1) and CsI(T1) excited by X-rays are reported and some discussion concerning with also some experiments carried out by other authors are presented.
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