STUDY OF X-RAY MICROSCOPY USING ULTRAVIOLET AND X-RAY DOUBLE-RESONANCE ABSORPTION

The UV-and-x-ray double-resonance absorption process in 1 mu m tryptop han grains was studied. The excited molecular density can be obtained by the use of a three-state model far UV absorption. The dependence of the x-ray transmittance on the UW-laser photon flux using was investi gated using the x-ray absorption cross sections obtained by a calculat ion based on the atomic Hartree-Slater method. It was found that x-ray absorption is increased markedly by the use of a 5-ns UV pulse with a peak photon flux of similar to 10(25) photons cm(-2) s(-1). Furthermo re, the feasibility of x-ray microscopy using double-resonance absorpt ion is considered. It is expected that the images of particular molecu les can be obtained selectively with a good signal-to-noise ratio. (C) 1996 Society of Photo-Optical instrumentation Engineers.