Journal of Physical Chemistry A, Vol.102, No.23, 4148-4153, 1998
Femtosecond two-photon laser photoelectron microscopy
It is shown that high-resolution photoelectron images (with a resolution of up to 3 nm for ultrasharp silicon tips) can be obtained for practically all materials when irradiating tips made of these materials by pulses of the second harmonic of a femtosecond Ti:sapphire laser. In addition to the images, absolute values of the two-photon external photoelectric effect for these tips also can be measured using this method. The first experimental realization of this two-photon femtosecond laser projection photoelectron microscope is presented, and corresponding data for silicon, diamond, and calcium fluoride tips are analyzed.
Keywords:ELECTRON-EMISSION;FIELD-EMISSION;COLOR-CENTERS;DIAMOND;SILICON;PHOTOEMISSION;SURFACE;SI(111);GROWTH;TIPS