Gain profile of transient collisional excitation X-ray laser M. Tanaka, T. Kawachi, M. Kado, N. Hasegawa, K. Sukegawa, A. Nagashima, Y. Kato et H. Takenaka J. Phys. IV France, 11 PR2 (2001) Pr2-55-Pr2-57 DOI: 10.1051/jp4:2001210