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Issue 38, 2009
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Resonant UV-fs-TCFWM spectroscopy on formaldehyde

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The first electronically excited singlet Ã 1A2 state of formaldehyde (H2CO) is the origin of different competing dissociation channels. An all-ultraviolet (UV) electronically resonant variant of time-resolved fs-two-colour four-wave mixing (fs-TCFWM) spectroscopy has been applied to monitor the dynamics of rovibrational manifolds in this state. The method provides a variety of options to probe molecular dynamics according to the temporal sequence of dipole transitions involved. Signal contributions arising from different molecular states can partially be distinguished by specific sequences of the applied laser pulses. A dispersed signal detection method reveals additional information that is often inaccessible using spectrally integrated detection. We discuss UV-fs-TCFWM experiments which involve resonant transitions to the rovibrational manifolds of the C–O stretch and out-of-plane combination bands in the first electronically excited singlet state of H2CO at energies close to the HCO production threshold. The experimental results are compared to simulations.

Graphical abstract: Resonant UV-fs-TCFWM spectroscopy on formaldehyde

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Publication details

The article was received on 08 Apr 2009, accepted on 11 Jun 2009 and first published on 15 Jul 2009

Article type: Paper
DOI: 10.1039/B907133D
Citation: Phys. Chem. Chem. Phys., 2009,11, 8456-8466
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    Resonant UV-fs-TCFWM spectroscopy on formaldehyde

    A. M. Walser, M. Meisinger, P. P. Radi, T. Gerber and G. Knopp, Phys. Chem. Chem. Phys., 2009, 11, 8456
    DOI: 10.1039/B907133D

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