Accession Number:

ADA564109

Title:

Imaging Surfaces and Nanostructures

Descriptive Note:

Final rept. 1 Jun 2007-30 Nov 2010

Corporate Author:

CALIFORNIA INST OF TECH PASADENA

Personal Author(s):

• Zewail, Ahmed H.

Report Date:

2011-02-28

Pagination or Media Count:

3.0

Abstract:

Publications of this research are reported in Science, JACS, JPC, ChemPhysChem, PNAS, Nano Lett., and PCCP. Developmentally, we have advanced ultrafast electron microscopy and diffraction to a new level. The electron pulses typically have an energy of 30 keV for diffraction and 100-200 keV for microscopy, corresponding to speeds of 33-70 of the speed of light. Recently, we introduced the concept of tilted optical pulses into diffraction and imaging techniques and demonstrated the methodology experimentally. In a separate contribution, we provided a novel approach for reaching the attosecond time domain. Such attosecond electron pulses are significantly shorter than those achievable with extreme UV light sources near 25 nm -50 eV and have the potential for applications in the visualization of ultrafast electron dynamics.

Descriptors:

• *ELECTRON MICROSCOPY
• *PHASE TRANSFORMATIONS
• ELECTRON DIFFRACTION
• NANOSTRUCTURES

Subject Categories:

• Test Facilities, Equipment and Methods
• Atomic and Molecular Physics and Spectroscopy
• Nuclear Physics and Elementary Particle Physics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE