PHOTOACOUSTIC INVESTIGATION OF THE RELAXATION OF THE 2E STATE OF RUBY M. Gallmeier, E. Strauss, R. Germer, W. Schubert, R.T. Brundage et W.M. Yen J. Phys. Colloques, 44 C6 (1983) C6-401-C6-405 DOI: 10.1051/jphyscol:1983666