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Direct measurement of nonequilibrium electron energy distribution in sub-picosecond laser-heated gold films

Technical Report ·
OSTI ID:7011148
; ;

Electron heating in metals by ultrashort laser pulses has been under intensive investigations in recent years. It is generally believed that in a very short time (< 1-2 fsec) after the optical excitation, the electrons equilibrate among themselves via the electron-electron interaction, and establish a thermal Fermi-Dirac distribution at an elevated temperature. The electron-phonon interaction operates on a longer timescale of several psec, the electrons are decoupled from lattice and it is possible to heat the electrons alone up to several thousand K. However no direct measurements of the electron energy distribution function in laser-heated metals have been reported so far. We have used ultraviolet photoemission spectroscopy to directly obtain the energy distribution function with 500 fsec time resolution.

Research Organization:
AT and T Bell Labs., Holmdel, NJ (United States)
OSTI ID:
7011148
Report Number(s):
AD-P-007093/8/XAB
Country of Publication:
United States
Language:
English

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Related Subjects

665300* -- Interactions Between Beams &amp; Condensed Matter-- (1992-)
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
BOSONS
COHERENT RADIATION
ELECTROMAGNETIC RADIATION
ELECTRON EMISSION
ELECTRON SPECTRA
ELEMENTARY PARTICLES
ELEMENTS
EMISSION
ENERGY-LEVEL TRANSITIONS
EXCITATION
FILMS
GOLD
HEATING
LASER-PRODUCED PLASMA
LASER-RADIATION HEATING
MASSLESS PARTICLES
METALS
PHONONS
PHOTONS
PLASMA
PLASMA HEATING
QUASI PARTICLES
RADIATIONS
SPECTRA
THIN FILMS
TRANSITION ELEMENTS