Separation of ionization and subsequent electronic excitation for formation of electronically excited ethanol cation in intense laser fields

• Published in: Journal of physics. B, Atomic, molecular, and optical physics Atomic, molecular, and optical physics, 2011-10, Vol.44 (19), p.191002-1-5
• Main Authors: Ikuta, T, Hosaka, K, Akagi, H, Yokoyama, A, Yamanouchi, K, Kannari, F, Itakura, R
• Format: Article
• Language: English
• Subjects: Atomic and molecular physics; Autoionization, photoionization, and photodetachment; Cations; Electronics; Ethanol; Ethyl alcohol; Exact sciences and technology; Excitation; Fundamental areas of phenomenology (including applications); Ionization; Lasers; Molecular properties and interactions with photons; Optics; Photon interactions with molecules; Physics; Quantum optics; Separation; Strong-field excitation of optical transitions in quantum systems; multi-photon processes; dynamic stark shift
• ISSN: 0953-4075; 1361-6455
• DOI: 10.1088/0953-4075/44/19/191002

Ionization and subsequent electronic excitation occurring within the same laser pulse (400 nm, 96 fs, 1.3 similar to 18 TW cm super(-2)) are separately investigated by measuring in coincidence an electron and a product ion produced from C sub(2)H sub(5)OH. It is revealed that the nascent population in the electronically excited C sub(2)H sub(5)OH super(+) prepared by the ionization decreases as the laser intensity increases, while the subsequent electronic excitation is enhanced through the resonant electronic transitions. Ionization and electronic excitation mechanisms are described based on the electronic-state distributions of C sub(2)H sub(5)OH super(+).