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Combination of a Knudsen effusion cell with a quartz crystal microbalance: In situ measurement of molecular evaporation rates with a fully functional deposition source
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10.1063/1.3292510
/content/aip/journal/rsi/81/1/10.1063/1.3292510
http://aip.metastore.ingenta.com/content/aip/journal/rsi/81/1/10.1063/1.3292510
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Figures

Image of FIG. 1.
FIG. 1.

Design of the molecular evaporator. (1) Rotatable shutter with integrated QCMB. One electrode of the QCMB crystal is connected to a coaxial cable and isolated by a macor plate. The whole shutter is attached to a rotary feedthrough. (2) Knudsen cell. (3) Thermocouple feedthrough (type ), connected to (12). (4) Power feedthroughs for filament current, connected to (11). (5) BNC signal feedthrough (grounded to body) connected to the quartz crystal via a coaxial cable. (6) Macor plate clamping QCMB. (7) Copper plate connecting back electrode of QCMB to coaxial cable. (8) Quartz crystal. (9) Stainless steel shutter with 10 mm orifice. (10) Molybdenum crucible housed and stabilized by macor holders and spacers. (11) Heating coil made from 0.3 mm tantalum wire. (12) Thermocouple attached to a flat spring to assure good thermal connection to the crucible. (13) Two stainless steel radiation shields to minimize heat loss to the environment.

Image of FIG. 2.
FIG. 2.

(a) Accumulated mass of TPB molecules on the QCMB as a function of deposition time at different evaporation temperatures (inset: chemical structure of TPB). A linear mass increase with time is perceptible for all temperatures (from 80 to ). The slope of the straight lines increases with evaporation temperature and yields the rate of molecular deposition. (b) Same for TBB. (c) Arrhenius plot of deposition rates versus evaporation temperature from (a) and (b). The sublimation enthalpy of the respective compound can be extracted from the slope.

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/content/aip/journal/rsi/81/1/10.1063/1.3292510
2010-01-25
2014-04-21
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: Combination of a Knudsen effusion cell with a quartz crystal microbalance: In situ measurement of molecular evaporation rates with a fully functional deposition source
http://aip.metastore.ingenta.com/content/aip/journal/rsi/81/1/10.1063/1.3292510
10.1063/1.3292510
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