The total yield photoemission of a polycrystalline molybdenum sample irradiated by 790 nm-150 fs laser pulses is measured in the absence of space charge saturation. The extracted charge versus the laser intensity, measured over three decades of the extracted charge, which represents a significant extension of the previous experiments, gives us the opportunity to test the so-called thermally assisted non-linear photoemission model. The present results show non-linear photoemission behavior that can be explained, as expected, by a thermally assisted 3-photon emission. However a pure 4-photon emission could not be discarded. To take aim at clarifying this question the related non-linear coefficients are calculated and a scaling law for the probability of different multiphoton orders is proposed. (C) 2001 Elsevier Science Ltd. All rights reserved.

Nonlinear photoemission from polycristalline molibdenum irradiated by 790 nm -150 fs laser pulses / Peloi M; Ferrini G; Banfi G; Secondi G; Parmigiani F. - In: SOLID STATE COMMUNICATIONS. - ISSN 0038-1098. - STAMPA. - 118:7(2001), pp. 339-344.

Nonlinear photoemission from polycristalline molibdenum irradiated by 790 nm -150 fs laser pulses

BANFI, GIAN PIERO;
2001

Abstract

The total yield photoemission of a polycrystalline molybdenum sample irradiated by 790 nm-150 fs laser pulses is measured in the absence of space charge saturation. The extracted charge versus the laser intensity, measured over three decades of the extracted charge, which represents a significant extension of the previous experiments, gives us the opportunity to test the so-called thermally assisted non-linear photoemission model. The present results show non-linear photoemission behavior that can be explained, as expected, by a thermally assisted 3-photon emission. However a pure 4-photon emission could not be discarded. To take aim at clarifying this question the related non-linear coefficients are calculated and a scaling law for the probability of different multiphoton orders is proposed. (C) 2001 Elsevier Science Ltd. All rights reserved.
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Utilizza questo identificativo per citare o creare un link a questo documento: http://hdl.handle.net/11571/100941
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