Laser-driven flow reactor as a cluster beam source

Abstract

A novel technique for the production of expansion-cooled cluster beams from materials with low vapor pressure is presented. The clusters are produced in a flow reactor from gas phase reactants by aggregation of CO2-laser-induced decomposition products. By introducing a conical nozzle into the reaction zone, they are extracted into a molecular beam apparatus and analyzed with a time-of-flight mass spectrometer. Depending on the type of CO2-laser employed, the source can be operated in the pulsed or continuous mode. The generation of carbon and silicon clusters is demonstrated by decomposing gaseous C2H2 and SiH4, respectively. The laser-driven cluster course is also employed to generate fullerenes and nanosized silicon particles.

Lattice contraction in nanosized silicon particles produced by laser pyrolysis of silane

“…The Si particles were generated by laser-induced decomposition of silane in a gas flow reactor that has been described in detail elsewhere [13][14][15][16]. Silane gas flushed with helium is admitted to the centre of the reactor where the gas flow is crossed by a pulsed CO 2 laser beam.…”

“…A recently developed novel cluster source [13] yielding well defined, narrowly dispersed particles [14] has proven to be particularly well suited for the aim of particle fabrication. The apparatus combines laser-induced decomposition of silane a Corresponding author.…”

Crystalline silicon nanoparticles as carriers for the Extended Red Emission

“…This apparatus and the characterization techniques used have been thoroughly described before in Ehbrecht et al (1995), Ehbrecht et al (1997), Ehbrecht & Huisken (1999), and Ledoux et al (2000a). The reader is referred to these papers for a complete description of the method.…”

Wet - Chemically Etched Silicon Nanowire Architectures: Formation and Properties

“…Peng, 2002;Hochbaum, 2009;Qu, 2009;Sivakov, 2009; or silicon nanocrystals (Si-NCs) (e.g. Ehbrecht, 1995) and also a lot of publications about PL originating from single SiNWs (e.g. Walavalkar, 2010) or Si-NCs .…”