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Thin films composed of 400–500 monolayers (ML) of either amorphous solid water (ASW) or ASW/CO2 mixtures are grown atop a MgO(100) substrate under ultrahigh vacuum conditions. Samples are irradiated at an infrared frequency of 3424 cm–1, which lies within the broad OH stretch band of condensed water. Ablation is achieved using 10 ns pulses whose energy (<2.7 mJ) is focused to a beam waist of approximately 0.5 mm. By using a time-of-flight mass spectrometer to monitor ablated material, excellent single-shot detection is demonstrated. This capability is essential because, in general, the first infrared pulse can induce irreversible changes throughout the irradiated volume. With ASW/CO2 samples, CO2 is released preferentially. This is not surprising in light of the metastability of the samples. Indeed, repeated irradiation of the same spot can rid the sample of essentially all of the CO2 in as little as a few pulses, whereas only 10–20 ML of H2O are removed per pulse. The influence of the substrate is profou...

Amorphous Solid Water (ASW): Pulsed Laser Ablation of ASW/CO2 Thin Films

Amorphous Solid Water (ASW): Pulsed Laser Ablation of ASW/CO₂ Thin Films