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Author Ageev, Eduard ♦ Mizobata, Keisuke ♦ Nakajima, Takashi ♦ Zen, Heishun ♦ Kii, Toshiteru ♦ Ohgaki, Hideaki
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS ♦ AMORPHOUS STATE ♦ DETECTION ♦ FILMS ♦ FREE ELECTRON LASERS ♦ LASER-RADIATION HEATING ♦ MATERIALS ♦ NEODYMIUM LASERS ♦ POLYETHYLENES ♦ PROBES ♦ PULSES ♦ SWITCHES ♦ TIME DEPENDENCE ♦ TIME RESOLUTION
Abstract Some of the vibrational modes of crystalline organic polymers are known to be sensitive to the structural change from the crystalline phase to the amorphous phase, and vice versa. Using a mid-infrared (mid-IR) pulse from a free-electron laser as a probe, we demonstrate the time-resolved detection of structural change in crystalline polymer (polyethylene) films upon laser heating by a Q-switched Nd:YAG laser. Transmittance of the resonant mid-IR pulse almost instantaneously changes before and after the Nd:YAG laser pulse if its fluence is sufficient to induce the structural change in the film. The developed technique would be useful to study the time-dependent dynamics of the structural change in various materials.
ISSN 00036951
Educational Use Research
Learning Resource Type Article
Publisher Date 2015-07-27
Publisher Place United States
Journal Applied Physics Letters
Volume Number 107
Issue Number 4


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