Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Electron Spin Resonance Scanning Tunneling Microscope of Non-Magnetic
  Molecules   Electron Spin Resonance-Scanning Tunneling Microscopy (ESR-STM) of C60
radical ion on graphene is a first demonstration on radical ions. ESR-STM
signal at g=2.00 was measured in accordance with macroscopic ESR of fullerene
radical ion. The ESR-STM signal was bias voltage dependent, as it reflects the
charge state of the molecule. The signal appears in the bias voltage which
enables the ionization of the lowest unoccupied molecular orbital (LUMO)
(creation of radical anion) and the highest occupied molecular orbital (HOMO
(creation of a radical cation) of the C60 molecule when it deposited on
graphene.
  The linewidth provides information on the lifetime of the free radical. In
several experiments, a 13C hyperfine splitting was observed, and a change in
the phase of the ESR-STM peak as a function of the speed of the magnetic field
sweep was changed. This might be used to provide information on the relaxation
times of the molecules. In parallel, ESR-STM signal at g=1.6 was ascribed to
Tungsten oxide (W5+) at the tip apex, which is not bias voltage dependent.
  The ability of ESR-STM to explore non paramagnetic molecules, significantly
broadens the scope of this technique.

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The categories of this paper are: hep-ph
26
The categories of this paper are: bayes-an
28
The categories of this paper are: alg-geom
10
The categories of this paper are: q-bio
16
The categories of this paper are: stat
7
The categories of this paper are: hep-th
29
The categories of this paper are: funct-an
32
The categories of this paper are: atom-ph
27
The categories of this paper are: comp-gas
6
The categories of this paper are: astro-ph
12
The categories of this paper are: nucl-th
30
The categories of this paper are: q-alg
19
The categories of this paper are: eess
22
The categories of this paper are: chao-dyn
37
The categories of this paper are: supr-con
34
The categories of this paper are: chem-ph