Photodesorption of Na atoms from rough Na surfaces

Abstract

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Dynamics of alkali-metal atom photodesorption from polymer thin films

“…This mechanism would explain several experimentally observed characteristics of laser-induced alkali-metal desorption from alkali-metal layers on dielectrics too [11], but it cannot explain the observed independence of kinetic energies on desorption wavelength [12], which in turn means that the initial excitation is decoupled from the final desorption process.…”

“…Beginning with investigations of laser-induced desorption of sodium atoms from Na films adsorbed on multicrystalline sapphire and quartz surfaces [10], systematic studies have been performed for rough alkali-metal films adsorbed on lithium fluoride [11] and mica surfaces [12]. In fact, under most circumstances Na forms clusters upon adsorption on dielectrics.…”

Surface plasmon enhanced substrate mediated photochemistry on roughened silver

“…[26][27][28] We propose that the observation of photodissociation at roughened surfaces reported here suggests a means of photochemically modifying the surface properties of such metal clusters. A novel surface enhancement effect has been observed which is in addition to the more familiar mechanism of photochemistry at the surface of flat single crystal metal substrates.…”

Molecular Desorption by Laser–Driven Acoustic Waves: Analytical Applications and Physical Mechanisms

“…For the first time, this gap in knowledge can now be filled by processing our experimental data from the signal-vs-delay dependencies and converting them into kinetic energy distributions corresponding to our experimental conditions. Our experiment geometry (Fig.5) is rather common, and the detailed discussion of the method as well as the appropriate conversion equations can be found elsewhere (Young, Whitten et al 1989;Balzer, Gerlach et al 1997). Typical values of the distance S and the thickness of ionization volume dS were set to 3 and 0.4 mm, respectively.…”

“…Within the limits of accuracy of our measurements, no change of average velocity has been detected, which suggests that both thermal and "shake-off" models are not applicable for the explanation of LIAD process. In order to calculate the mean energies of desorbed molecules, we used the described above approach and took into account that the Jacobian of this variable transformation was given by S 2 /t 3 (Balzer, Gerlach et al 1997). The mean energies of molecules in LIAD experiments (as well as their mean velocities) showed no apparent trend with the increase of desorbing laser fluences keeping the average value at about 9 meV for rhodamine B, 9.5 meV for BBQ, 6.5meV for coumarine 522 and 7.5meV for methylanthracene.…”