Spectroscopic Study of Ne Clusters Irradiated by an Intense Femtosecond Laser

X-ray emission (4~18 nm) from small-sized Ne clusters heated by high-intensity, 25~100 fs laser pulses is spectroscopically inverstigated. The Ne spectrum started to drastically change in emitting ions from Ne5+ to Ne7+ below the pre-expansion temperature of -120 °C. The significant change in the spe