Laser-Induced Processes in Thin Ices A2

TY - CHAP

T1 - Laser-Induced Processes in Thin Ices A2

AU - Thrower, J.D.

AU - Zacharias, H.

PY - 2018/1/1

Y1 - 2018/1/1

N2 - The application of lasers to studying desorption from thin ice films is discussed, with a focus on systems of relevance to interstellar chemistry. Energetic processing of ices bound to interstellar dust grains is introduced, along with a discussion of the photon sources present in such environments. Appropriate laser systems to promote desorption, as well as probe the desorption products are outlined, along with an introduction to the typical measurements that are performed in the laboratory. The various ways in which the incident photons can drive processes such as desorption is then discussed. Absorption by the underlying substrate can lead to a surface heating which drives a thermal desorption process, or produce a population of hot electrons that can drive desorption and surface chemistry through interactions with the adsorbed layer. In addition, the ice layer itself can absorb in the IR through vibrational excitation and in the VUV-UV-visible wavelength ranges through electronic transitions, leading to a variety of possible desorption scenarios. These are discussed in terms of relevant examples taken from the literature.

AB - The application of lasers to studying desorption from thin ice films is discussed, with a focus on systems of relevance to interstellar chemistry. Energetic processing of ices bound to interstellar dust grains is introduced, along with a discussion of the photon sources present in such environments. Appropriate laser systems to promote desorption, as well as probe the desorption products are outlined, along with an introduction to the typical measurements that are performed in the laboratory. The various ways in which the incident photons can drive processes such as desorption is then discussed. Absorption by the underlying substrate can lead to a surface heating which drives a thermal desorption process, or produce a population of hot electrons that can drive desorption and surface chemistry through interactions with the adsorbed layer. In addition, the ice layer itself can absorb in the IR through vibrational excitation and in the VUV-UV-visible wavelength ranges through electronic transitions, leading to a variety of possible desorption scenarios. These are discussed in terms of relevant examples taken from the literature.

KW - Astrochemistry

KW - Ice films

KW - Interstellar chemistry

KW - Laser desorption

KW - Laser heating

KW - Nonthermal desorption

KW - Photodesorption

KW - Photon irradiation

KW - State-selective detection

KW - Surface chemistry

KW - Thermal desorption

UR - http://www.scopus.com/inward/record.url?scp=85079262191&partnerID=8YFLogxK

U2 - 10.1016/B978-0-12-409547-2.13225-1

DO - 10.1016/B978-0-12-409547-2.13225-1

M3 - Book chapter

SN - 978-0-12-809894-3

SP - 478

EP - 490

BT - Encyclopedia of Interfacial Chemistry

A2 - Wandelt, Klaus

PB - Elsevier

CY - Oxford

ER -