Accession Number:

AD0612958

Title:

MOLECULAR FLOW AND THE EFFUSION PROCESS IN THE MEASUREMENT OF VAPOR PRESSURES. PART 2. ADDITIONAL DATA AND DETAILS OF EQUIPMENT

Descriptive Note:

Annual rept. for 1 Jun 1963-31 Aug 1964

Corporate Author:

OKLAHOMA STATE UNIV STILLWATER RESEARCH FOUNDATION

Personal Author(s):

• Freeman, Robert D.

Report Date:

1965-01-01

Pagination or Media Count:

111.0

Abstract:

Details are given for molecular beam apparatus for the measurement of the angular distribution of molecules effusing from non-ideal orifices. The vacuum microbalance and furnace which are used in the microbalance-inverted Knudsen effusion-recoil Miker technique for determining vapor pressures and molecular weights are described in detail. Miker results are given for the vapor pressure of silver, gold, and calcium fluoride. Some data on the diffusion of silver and gold vapors through graphite cell walls resulted as a by-product of these studies. Values obtained for the molecular weights of tin and calcium fluoride vapors are somewhat ambiguous, but do indicate that improvements in the technique are still possible and necessary. An analysis of the rate of effusion from a cooling Knudsen effusion cell is given. The complete details of an analysis and computation of transmission probabilities, angular distribution functions, and recoil force corrections for conical and cylindrical orifices are now available.

Descriptors:

• *VAPOR PRESSURE
• *RAREFIED GAS DYNAMICS
• MEASUREMENT
• VAPORS
• MOLECULAR WEIGHT
• COOLING
• MOLECULAR BEAMS
• TIN
• DIFFUSION
• CALCIUM COMPOUNDS
• GOLD
• FLUORIDES
• SILVER
• FURNACES
• BALANCES

Subject Categories:

• Atomic and Molecular Physics and Spectroscopy

Distribution Statement:

APPROVED FOR PUBLIC RELEASE