We present the first threshold ion-pair production spectrum of a triatomic molecule. We have recorded the ion-pair yield spectrum and TIPP spectrum for the H 2 S f H + +SHion-pair channel using single-photon excitation. From the TIPP spectrum, we have determined the H-SH bond energy (31451 ( 4 cm -1 ) to unprecedented accuracy and demonstrated the formation of weakly bound H + -SH -(J′) ion-pair states, with rotational excitation of the SHanion up to J′ ) 4. The bound nature of these states, and the assigned spectrum that results from their field dissociation suggests that this technique can be applied to many other triatomic and larger polyatomic molecules in the future, leading to energetic, spectroscopic, and dynamical information about these species.

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Microstructured tungsten oxide (WO3) fabricated by laser‐irradiating tungsten foil in methanol has been developed as a substrate to soft‐ionize small‐molecular‐weight compounds by surface‐assisted laser desorption/ionization mass spectrometry. The material can be used to detect a wide variety of low molecular weight polar analytes in their protonated and deprotonated forms and non‐polar species as radical cations.