Instruct: Identify the main and secondary category of Arxiv papers based on the titles and abstracts
Query: Broadband 180 degree universal rotation pulses for NMR spectroscopy
  designed by optimal control   Broadband inversion pulses that rotate all magnetization components 180
degrees about a given fixed axis are necessary for refocusing and mixing in
high-resolution NMR spectroscopy. The relative merits of various methodologies
for generating pulses suitable for broadband refocusing are considered. The de
novo design of 180 degree universal rotation pulses using optimal control can
provide improved performance compared to schemes which construct refocusing
pulses as composites of existing pulses. The advantages of broadband universal
rotation by optimized pulses (BURBOP) are most evident for pulse design that
includes tolerance to RF inhomogeneity or miscalibration. We present new
modifications of the optimal control algorithm that incorporate symmetry
principles and relax conservative limits on peak RF pulse amplitude for short
time periods that pose no threat to the probe. We apply them to generate a set
of pulses suitable for widespread use in Carbon-13 spectroscopy on the majority
of available probes.

5
The categories of this paper are: gr-qc
22
The categories of this paper are: chao-dyn
18
The categories of this paper are: econ
26
The categories of this paper are: bayes-an
12
The categories of this paper are: nucl-th
2
The categories of this paper are: math
23
The categories of this paper are: solv-int
37
The categories of this paper are: supr-con
27
The categories of this paper are: comp-gas
11
The categories of this paper are: hep-lat
33
The categories of this paper are: plasm-ph
0
The categories of this paper are: hep-ph
29
The categories of this paper are: funct-an
17
The categories of this paper are: q-fin
13
The categories of this paper are: quant-ph
32
The categories of this paper are: atom-ph