Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Intense pulsed helium droplet beams   Pulsed (30 - 100 microseconds) nozzle beams have been used to generate helium
droplets (<N> = 10^4-10^5). The dependence of the beam intensity and the mean
droplet size on the source stagnation pressure and temperature are studied via
mass spectroscopy and laser induced fluorescence of embedded phthalocyanine
molecules. In comparison to a cw beam the pulsed source for the same pressure
and temperature has a factor of 100 higher flux and the droplet sizes are an
order of a magnitude larger.

28
The categories of this paper are: alg-geom
14
The categories of this paper are: math-ph
32
The categories of this paper are: atom-ph
1
The categories of this paper are: cs
8
The categories of this paper are: hep-ex
25
The categories of this paper are: patt-sol
11
The categories of this paper are: hep-lat
35
The categories of this paper are: mtrl-th
10
The categories of this paper are: q-bio
30
The categories of this paper are: q-alg
36
The categories of this paper are: cmp-lg
37
The categories of this paper are: supr-con
19
The categories of this paper are: eess
4
The categories of this paper are: cond-mat
13
The categories of this paper are: quant-ph
18
The categories of this paper are: econ