Analyses of the short pulse laser pumped transient collisional excited X-ray lasers A. Sasaki, T. Utsumi, K. Moribayashi, A. Zhidkov, M. Kado, M. Tanaka, N. Hasegawa and T. Kawachi J. Phys. IV France, 11 PR2 (2001) Pr2-75-Pr2-78 DOI: 10.1051/jp4:2001213