Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: The challenge of attosecond pulse metrology   The two basic approaches underlying the metrology of attosecond pulse trains
are compared, i.e. the 2nd order Intensity Volume Autocorrelation and the
Resolution of Attosecond Beating by Interference of Two photon Transitions
(RABITT). They give rather dissimilar results with respect to the measured
pulse durations. It is concluded that RABITT may underestimate the duration due
to variations of the driving intensity, but in conjunction with theory, allows
an estimation of the relative contributions of two different electron
trajectories to the extreme-ultraviolet emission.

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The categories of this paper are: hep-ph
24
The categories of this paper are: dg-ga
35
The categories of this paper are: mtrl-th
16
The categories of this paper are: stat
32
The categories of this paper are: atom-ph
29
The categories of this paper are: funct-an
5
The categories of this paper are: gr-qc
13
The categories of this paper are: quant-ph
10
The categories of this paper are: q-bio
12
The categories of this paper are: nucl-th
4
The categories of this paper are: cond-mat
27
The categories of this paper are: comp-gas
22
The categories of this paper are: chao-dyn
14
The categories of this paper are: math-ph
20
The categories of this paper are: acc-phys
36
The categories of this paper are: cmp-lg