Abstract
The scattering spectrum of orthorhombic TlI has been measured at 2 K under the resonant excitation around the first exciton energy of 2.87 eV. The spectrum is composed of multiple LO phonon lines showing a characteristic intensity alternation as was found in indium halides. The dependence of intensities of the LO lines on the incident photon energy has been investigated. The LO lines show a resonant enhancement in intensity with 2 s and higher exciton states as well as with the 1 s exciton state. It is also found that some of the excitons relaxed to the band bottom are transformed into photons with the emission of 2LO phonons rather than 1LO phonon.
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