Direct measurement of the photoelectron collection efficiency in the EMI 9558 photomultiplier yields a value of 75 ± 10%. The authors of this paper believe the substantially lower values recently reported to be spurious and discuss their reasons for this.
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Values in parentheses are not considered reliable.
Mean of all reliable values.
Product of ND-2 and ND-3 measured separately.
Mean of previous two columns.
With GG-14 filter alone at 5000 Å.
Table II
Summary of Photoelectron-Collection Efficiency Dataa
Values in parentheses are not considered reliable.
Expected counts per 10-sec interval, corrected for discriminator setting (see Fig. 3).
Observed counts per 10-sec interval, corrected for nonlinearity due to pulse overlap at high rates.
Tables (2)
Table I
Dark Filter Transmission Measurementsa (Transmission in Units of 10−5)
Values in parentheses are not considered reliable.
Mean of all reliable values.
Product of ND-2 and ND-3 measured separately.
Mean of previous two columns.
With GG-14 filter alone at 5000 Å.
Table II
Summary of Photoelectron-Collection Efficiency Dataa
Values in parentheses are not considered reliable.
Expected counts per 10-sec interval, corrected for discriminator setting (see Fig. 3).
Observed counts per 10-sec interval, corrected for nonlinearity due to pulse overlap at high rates.