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Volumn 82, Issue 3, 2011, Pages

Preparation and accurate measurement of pure ozone

Author keywords

[No Author keywords available]

Indexed keywords

ACCURATE MEASUREMENT; BUFFER VOLUME; COMPOSITIONAL ANALYSIS; HIGH PURITY; MEASUREMENT ACCURACY; OZONE DECOMPOSITION; OZONE PRODUCTION; REACTIVE GAS; VACUUM SYSTEM;

EID: 79953655389     PISSN: 00346748     EISSN: None     Source Type: Journal    
DOI: 10.1063/1.3557512     Document Type: Article
Times cited : (19)

References (45)
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    • 2)dt
    • 2)dt.
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    • note
    • 2, the buffer gas will be pushed in the direction of the ozone volume. Associated effects, such as total pressure rise and corresponding diminution of the diffusion constant as well as a shift of characteristic lengths l and L, will stay small and have negligable effects as long as ozone conversion remains small. Local decomposition even slows down overall ozone conversion, because total pressure and the effective buffer gas length (l) are increased. On the contrary, the entrance of buffer gas into the absorption cell is facilitated. An upper limit for buffer gas diffusion can nevertheless be obtained from Eq.: (i) estimate the pressure rise from Eq., (ii) recalculate l, L, and D assuming a new initial distribution of ozone and oxygen, where the converted ozone from (i) is removed from the ozone reservoir and its oxygen equivalent added to the oxygen volume, and (iii) determine the buffer gas diffusion using the new initial distribution obtained in step (ii).
  • 28
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    • note
    • Equation can be derived using the technique of superposition of point source distribution functions (see textbooks, such as Ref.) and for reasons of simplicity we have assumed a constant diameter gas line, even though the absorption cell connected to the longer buffer arm has a different diameter than the buffer line. Inspection of the solutions under measurement conditions (t 50 s) shows that the exact value of the length of the longer arm and the cell, which is around 330 cm, is not critical in terms of the absolute number of ozone molecules reaching the sensor head, because molecules from the closed boundary have not yet diffused into the buffer region. L has thus been adjusted in order to reflect the ratio of volumes between the two buffer arms assuming a constant diameter. This assures correct prediction of the relative pressure change.
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