Decomposition of the TOF spectrum into four Lorentzian curves: 20Ne+ from the uncondensed gas and from the cluster, and 22Ne+ from the uncondensed gas and from the cluster

Figure 2. Decomposition of the TOF spectrum into four Lorentzian curves: 20Ne+ from the uncondensed gas and from the cluster, and 22Ne+ from the uncondensed gas and from the cluster.

Abstract

We carried out time-of-flight mass spectrometry for neon clusters that were exposed to intense free electron laser pulses with the wavelength of 62 nm, which induce optical transition from the ground state (2s2 2p6) to an excited state (2s2 2p5nl ) in the Ne atoms. In contrast to Ne+ ions produced by two-photon absorption from isolated Ne atoms, the Ne+ ion yield from Ne clusters shows a linear dependence on the laser intensity (I). We discuss the ionization mechanisms which give the linear behaviour with respect to I and expected features in the electron emission spectrum.