Article ID | Journal | Published Year | Pages | File Type |
---|---|---|---|---|
1192946 | International Journal of Mass Spectrometry | 2015 | 6 Pages |
•Selective ionization of oriented methanol by asymmetric laser field.•Inspection of the dependence of H3+, OD+ and HOD+ fragment ions on the phase of the asymmetric laser field.•Angular distribution of H3+, OD+ and HOD+ fragment ions.
Multielectron dissociative ionization of gas phase deuterated methanol (CH3OD) molecules under the irradiation of a 30 fs asymmetric two color (ω/2ω) laser field is studied by means of time-of-flight mass spectrometry. The dependence on phase φ between the two laser beams of OD+, HOD+, H3+ fragment ions released from the dissociation of the dication has been investigated. Based on the phase dependence and the recorded angular distributions, it is proposed that the OD+, HOD+ ions can be ejected from fast and slow dissociation processes. The fast dissociation process is attributed to fragmentation from singlet states. The possibility that the slow dissociation process involves a long-lived metastable state and/or dissociation from triplet states is also discussed. The dependence of the H3+ ion on phase φ reveals the existence of two different, as far as the time scale is concerned, stages in its production.
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