Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: ab initio frame transformation calculations of direct and indirect
  dissociative recombination rates of HeH+ + e-   The HeH$^+$ cation undergoes dissociative recombination with a free electron
to produce neutral He and H fragments. We present calculations using ab initio
quantum defects and Fano's rovibrational frame transformation technique, along
with the methodology of PRL 89, 263003 (2002), to obtain the recombination rate
both in the low-energy (1-300 meV) and high-energy (ca. 0.6 hartree) regions.
We obtain very good agreement with experimental results, demonstrating that
this relatively simple method is able to reproduce observed rates for both
indirect dissociative recombination, driven by rovibrationally autoionizing
states in the low-energy region, and direct dissociative recombination, driven
by electronically autoionizing Rydberg states attached to higher-energy excited
cation channels.

24
The categories of this paper are: dg-ga
15
The categories of this paper are: nucl-ex
30
The categories of this paper are: q-alg
7
The categories of this paper are: hep-th
29
The categories of this paper are: funct-an
25
The categories of this paper are: patt-sol
35
The categories of this paper are: mtrl-th
32
The categories of this paper are: atom-ph
16
The categories of this paper are: stat
22
The categories of this paper are: chao-dyn
27
The categories of this paper are: comp-gas
12
The categories of this paper are: nucl-th
1
The categories of this paper are: cs
9
The categories of this paper are: nlin
31
The categories of this paper are: ao-sci
17
The categories of this paper are: q-fin