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Characteristics and diagnostics of an ultrahigh vacuum compatible laser ablation source for crossed molecular beam experiments
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10.1116/1.2194935
/content/avs/journal/jvsta/24/3/10.1116/1.2194935
http://aip.metastore.ingenta.com/content/avs/journal/jvsta/24/3/10.1116/1.2194935

Figures

Image of FIG. 1.
FIG. 1.

Three dimensional composite drawings of the laser ablation source in the primary source region together with the skimmer (the differential wall is omitted for clarity).

Image of FIG. 2.
FIG. 2.

Top view of the experimental setup with differentially pumped regions I–III and source chambers.

Image of FIG. 3.
FIG. 3.

Partial residual gas spectrum of the ionizer taken at three different parameter sets of the lenses. (a) Extractor: , filament current: , ion energy: , and entrance/exit lens: ; (b) extractor: , filament current: , ion energy: , and entrance/exit lens: ; and (c) extractor: , filament current: , ion energy: , and entrance/exit lens: . The shape of the mass peaks does not depend on the kinetic energy of the electrons held typically between 80 and . The quadrupole housing was grounded; the pre- and postfilters were set to .

Image of FIG. 4.
FIG. 4.

Time-of-flight spectra of helium seeded (, blue) atomic carbon (, black), dicarbon (, red), and tricarbon (, green) taken at different delay times between the pulsed valve and the laser. Data were taken with the oscillator (resolution: mass separation) with emission current and a discriminator setting of .

Image of FIG. 5.
FIG. 5.

Time-of-flight spectra of neon seeded ( , blue) atomic carbon (, black), dicarbon (, red), and tricarbon (, green) taken at different delay times between the pulsed valve and the laser. Data were taken with the oscillator (resolution: mass separation) with emission current and a discriminator setting of .

Image of FIG. 6.
FIG. 6.

Time-of-flight spectra of the dicarbon beam recorded at different emission currents of the electron impact ionizer utilizing parameter set (c) from Fig. 3. TOF spectra have been normalized for intensity.

Image of FIG. 7.
FIG. 7.

Time-of-flight spectrum of the butadiynyl radical recorded at two emission currents of the electron impact ionizer at (solid line) and (dashed line).

Tables

Generic image for table
TABLE I.

Mass-to-charge values and assignment of species observed in the residual gas analyzer mode of our Extrel mass spectrometer. Data were taken with the oscillator . Species at values larger than 44 contribute less than five counts compared to 3000 counts for . Thorium and iridium bearing species originate from the filament, copper from the heated copper leads to the ionizer, and iron/nickel/chromium from the heated stainless steel electrodes.

Generic image for table
TABLE II.

Typical delay times, peak velocities , and speed ratios of supersonic dicarbon beams. The speed ration is defined via Eq. (1) with , with being the mass of the species, the ideal gas constant, and the temperature of the beam.

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/content/avs/journal/jvsta/24/3/10.1116/1.2194935
2006-05-01
2014-04-25
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Characteristics and diagnostics of an ultrahigh vacuum compatible laser ablation source for crossed molecular beam experiments
http://aip.metastore.ingenta.com/content/avs/journal/jvsta/24/3/10.1116/1.2194935
10.1116/1.2194935
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