We have recorded (1+1) resonance-enhanced multiphoton ionization spectra of complexes formed between NO and the alkanes: CH4, C2H6, C3H8, and n-C4H10. The spectra correspond to the |$\tilde A$| ← |$\tilde X$| transition, which is a NO-localized 3s ← 2pπ* transition. In line with previous work, the spectrum for NO–CH4 has well-defined structure, but this is only partially resolved for the other complexes. The spectra recorded in the NO+–alkane mass channels all show a slowly rising onset, followed by a sharp offset, which is associated with dissociation of NO–alkane, from which binding energies in the |$\tilde X$| and |$\tilde A$| states are deduced. Beyond this sharp offset, there is a further rise in signal, which is attributed to fragmentation of higher complexes, NO–(alkane)n. Analysis of these features allows binding energies for (NO–alkane) ··· alkane to be estimated, and these suggest that in the NO–(alkane)2 complexes, the second alkane molecule is bound to the first, rather than to NO. Calculated structures for the 1:1 complexes are reported, as well as binding energies.
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