Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Effect of humid air exposure on photoemissive and structural properties
  of KBr thin film photocathode   We have investigated the influence of water molecule absorption on
photoemissive and structural properties of potassium bromide (KBr) thin film
photocathode under humid air exposure at relative humidity (RH) 65%. It is
evident from photoemission measurement that the photoelectron yield of KBr
photocathode is degraded exponentially with humid air exposed time. Structural
studies of the "as-deposited" and "humid air aged" films reveal that there is
no effect of RH on film's crystalline face centered cubic (fcc) structure.
However, the average crystallite size of "humid air exposed film" KBr film has
been increased as compared to "as-deposited". In addition, topographical
properties of KBr film are also examined by means of scanning electron
microscope (SEM), transmission electron microscope (TEM) and atomic force
microscope (AFM) and it is observed that granular characteristic of film has
been altered, even for short exposure to humid air.

11
The categories of this paper are: hep-lat
32
The categories of this paper are: atom-ph
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The categories of this paper are: eess
21
The categories of this paper are: adap-org
4
The categories of this paper are: cond-mat
36
The categories of this paper are: cmp-lg
37
The categories of this paper are: supr-con
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The categories of this paper are: math-ph
2
The categories of this paper are: math
5
The categories of this paper are: gr-qc
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The categories of this paper are: funct-an
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The categories of this paper are: nlin
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The categories of this paper are: stat
0
The categories of this paper are: hep-ph
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The categories of this paper are: patt-sol
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The categories of this paper are: bayes-an