A compact molecular beam line

Abstract

A new supersonic molecular beam line has been attached to an existing UHV apparatus. Three different nozzles mounted on a rotatable manipulator allow for independent gas feeds. In this way, dosing sequences with different reactive gases can be carried out within a few minutes. Due to the compact design of the beam line, the apparatus does not forfeit its original flexibility and mobility. Apart from standard techniques like thermal desorption spectroscopy, low-energy electron diffraction, reflection absorption infrared spectroscopy and x-ray photoelectron/Auger electron spectroscopy, a quadrupole mass spectrometer mounted on a linear drive and viewports allows for photochemical experiments or other laser applications.

Evidence of stable high-temperature Dx-CO intermediates on the Ru(0001) surface

“…The experimental setup 16 consists of a triply differentially pumped molecular beam line connected to an UHV chamber with an ion sputter gun and a residual gas analyzer. A differentially pumped quadrupole mass spectrometer (QMS) is mounted on a linear drive in line-of-sight with the molecular beam.…”

The Energy Dependence of the Ratio of Step and Terrace Reactivity for H2 Dissociation on Stepped Platinum

“…Experiments were performed in a vacuum system. [19] A well-defined supersonic molecular beam was created by expansion of H 2 from about 1-4 atm through a 43 or 60 mm nozzle and subsequent collimation by skimmers and orifices into the ultrahigh vacuum chamber (base pressure < 10 À10 mbar). This chamber contains the stepped Pt single crystal surfaces, cut and polished from the same boule (5.5 N) to within 0.18 of the (211), (533), and (755) faces, respectively.…”

CO Blocking of D2 Dissociative Adsorption on Ru(0001)

“…[27,55] Briefly, it consists of a triply differentially pumped molecular beam line connected to an ultrahigh-vacuum (UHV) chamber with an ion sputter gun and a residual gas analyser (RGA). A differentially pumped quadrupole mass spectrometer (QMS) is mounted on a linear drive in line of sight with the molecular beam.…”