PHOTOSELECTIVE LASER PHOTO-ION MICROSCOPY WITH 5 NM RESOLUTION

Spectral selectivity has been attained in the method of field-ion micr oscopy with a spatial resolution of about 5 nm and time-of-flight dete rmination of the photo-ion masses. Light-absorbing CdSxSe1-x nanocryst als in a transparent glass matrix are detected by irradiating field ti ps made from red light filters with copper-vapor laser radiation. The nanocrystals appeared in the photo-ion images as bright spots on a dar k background. (C) 1998 American Institute of Physics.