title: Soft-x-ray emission from small-sized Ne clusters heated by intense, femtosecond laser pulses
abstract: Soft-x-ray emission from a cryogenically cooled Ne jet irradiated by intense, 25-fs laser pulses was measured. The Ne spectrum started to drastically change in emitting ions from Ne5+ to Ne7+ below the preexpansion temperature of -120 degrees C. The significant change in the spectrum is attributed to the collisional heating of small-sized Ne clusters formed in the cooled jet. The increase of the laser pulse length from 25 fs to 100 fs resulted in further increase of x-ray emission from Ne7+ states.
authors.affiliation: Department of Physics, KAIST, 373-1 Kusong-dong, Yusong-gu, Taejon 305-701, Korea.
authors.initials: T
authors.lastname: Mocek
authors.initials: CM
authors.lastname: Kim
authors.initials: HJ
authors.lastname: Shin
authors.initials: DG
authors.lastname: Lee
authors.initials: YH
authors.lastname: Cha
authors.initials: KH
authors.lastname: Hong
authors.initials: CH
authors.lastname: Nam