Transient collisional excitation X-ray laser generation with picoseconds laser pulses M. Kado, T. Kawachi, N. Hasegawa, M. Tanaka, K. Sukegawa, K. Nagashima et Y. Kato J. Phys. IV France, 11 PR2 (2001) Pr2-39-Pr2-42 DOI: 10.1051/jp4:2001206