Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Photoelectron Emission from Metal Surfaces Induced by VUV-emission of
  Filament Driven Hydrogen Arc Discharge Plasma   Photoelectron emission measurements have been performed using a
filament-driven multi-cusp arc discharge volume production H^- ion source
(LIISA). It has been found that photoelectron currents obtained with Al, Cu,
Mo, Ta and stainless steel (SAE 304) are on the same order of magnitude. The
photoelectron currents depend linearly on the discharge power. It is shown
experimentally that photoelectron emission is significant only in the short
wavelength range of hydrogen spectrum due to the energy dependence of the
quantum efficiency. It is estimated from the measured data that the maximum
photoelectron flux from plasma chamber walls is on the order of 1 A per kW of
discharge power.

2
The categories of this paper are: math
13
The categories of this paper are: quant-ph
35
The categories of this paper are: mtrl-th
15
The categories of this paper are: nucl-ex
1
The categories of this paper are: cs
32
The categories of this paper are: atom-ph
25
The categories of this paper are: patt-sol
21
The categories of this paper are: adap-org
4
The categories of this paper are: cond-mat
7
The categories of this paper are: hep-th
10
The categories of this paper are: q-bio
16
The categories of this paper are: stat
34
The categories of this paper are: chem-ph
36
The categories of this paper are: cmp-lg
5
The categories of this paper are: gr-qc
11
The categories of this paper are: hep-lat