Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Hyperpolarization read-out through rapidly rotating fields in the zero-
  and low-field regime   An integral part of para-hydrogen induced polarization (PHIP) methods is the
conversion of nuclear singlet order into observable magnetization. In this
study polarisation transfer to a heteronucleus is achieved through a selective
rotation of the proton singlet-triplet states driven by a combination of a
rotating magnetic field and a weak bias field. Surprisingly we find that
efficient polarisation transfer driven by a STORM (Singlet-Triplet Oscillations
through Rotating Magnetic fields) pulse in the presence of $\mu$T bias fields
requires rotation frequencies on the order of several kHz. The rotation
frequencies therefore greatly exceed any of the internal frequencies of typical
zero- to ultralow field experiments. We further show that the rotational
direction of the rotating field is not arbitrary and greatly influences the
final transfer efficiency. Some of these aspects are demonstrated
experimentally by considering hyperpolarised (1-$^{13}$C)fumarate. In addition,
we provide numerical simulations highlighting the resilience of the STORM pulse
against disruptive quadrupolar coupling partners. In contrast to most of the
existing methods, the STORM procedure therefore represents a promising
candidate for quadrupolar decoupled polarisation transfer in PHIP experiments.

18
The categories of this paper are: econ
1
The categories of this paper are: cs
0
The categories of this paper are: hep-ph
20
The categories of this paper are: acc-phys
17
The categories of this paper are: q-fin
35
The categories of this paper are: mtrl-th
29
The categories of this paper are: funct-an
21
The categories of this paper are: adap-org
7
The categories of this paper are: hep-th
37
The categories of this paper are: supr-con
25
The categories of this paper are: patt-sol
6
The categories of this paper are: astro-ph
28
The categories of this paper are: alg-geom
32
The categories of this paper are: atom-ph
9
The categories of this paper are: nlin
16
The categories of this paper are: stat