2018
DOI: 10.1021/acs.analchem.7b04797
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Development and Characterization of a Laser-Induced Acoustic Desorption Source

Abstract: A laser-induced acoustic desorption source, developed for use at central facilities, such as free-electron lasers, is presented. It features prolonged measurement times and a fixed interaction point. A novel sample deposition method using aerosol spraying provides a uniform sample coverage and hence stable signal intensity. Utilizing strong-field ionization as a universal detection scheme, the produced molecular plume is characterized in terms of number density, spatial extend, fragmentation, temporal distribu… Show more

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Cited by 16 publications
(27 citation statements)
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“…Laser-induced acoustic desorption (LIAD) is the best-known method of this kind; laser pulses striking one side of a metal foil result in desorption from a thin sample layer (#mm-order thickness) on the other side via a combination of thermal and non-thermal processes. 30,31 Laserbased thermal desorption 4,32,[33][34][35] differs from LIAD in that it applies a continuous wave (CW) laser to heat the foil and the desorption process is purely thermal. This relatively new technique (rst reported in 2015 (ref.…”
Section: Introductionmentioning
confidence: 99%
“…Laser-induced acoustic desorption (LIAD) is the best-known method of this kind; laser pulses striking one side of a metal foil result in desorption from a thin sample layer (#mm-order thickness) on the other side via a combination of thermal and non-thermal processes. 30,31 Laserbased thermal desorption 4,32,[33][34][35] differs from LIAD in that it applies a continuous wave (CW) laser to heat the foil and the desorption process is purely thermal. This relatively new technique (rst reported in 2015 (ref.…”
Section: Introductionmentioning
confidence: 99%
“…The first factor is the diverse range of experimental setups used in LIAD studies, which makes it difficult to expect that a single physical mechanism would be responsible for the acoustically induced desorption in all cases. The thickness and type of the substrate define the generation , and evolution (nonlinear sharpening and dissipation) of the acoustic waves, as well as the possible contribution of thermal desorption due to the heat transfer from the irradiated back side to the front side of the substrate. , In particular, while a slow increase in the molecular signal on the time scale of ∼10 μs is interpreted in ref as evidence in favor of the stored-surface-strain desorption model, this time scale exceeds the characteristic time of the heat diffusion through the 10 μm thick tantalum foil used in this study, suggesting a possible contribution of the thermal desorption. Furthermore, the analyte samples in LIAD experiments also exhibit a large variation of thickness, from micrometers , to about a monolayer coverage and to individual atomic or molecular adsorbates present on bare metal surfaces. , The mechanism of the acoustic desorption from a bare surface is likely to be rather different from that from a micrometer-thick molecular layer.…”
Section: Introductionmentioning
confidence: 80%
“…The strained surface features are then assumed to release the stored elastic energy in response to an acoustic stimulus, thus providing the needed extra energy for the desorption of molecules in LIAD. Although the latter idea has received a wide acceptance in the LIAD community, ,, we note that the connection between the release of the elastic energy stored in the strained films/islands and the desorption of intact molecular analytes has been demonstrated neither experimentally nor computationally so far.…”
Section: Introductionmentioning
confidence: 94%
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