User Manual Version 002 BRUKER BIOSPIN 285 (327)
23
Modified W-PMLG 23
Recently, a modified version of WPMLG was published by Leskes et al., which
suppresses the carrier spike completely and therefore allows placing the carrier
frequency o1, o1p arbitrarily. This is achieved by a 180 degree phase alternation
between consecutive WPMLG-pulses. The magic angle tilt pulse is then not re
-
quired anymore. This reduces setup time and enhances experimental possibilities
significantly.
Reference:
1. M. Leskes, P.K. Madhu
and S. Vega, A broad-banded z-rotation windowed phase modulated Lee–
Goldburg pulse sequence for
1
H spectroscopy in solid-state NMR, Chem. Phys. Lett. 447, 370 (2007).
Pulse Sequence Diagram for Modified W-PMLG 23.1
Figure 23.1. Pulse Sequence Diagram
Table 23.1. Phrases, RF-Levels, Timings
Phases RF Power Levels Timing
φ
1
= CYCLOPS, 1 2 3 0 pl12=set for around 100 kHz p1 around 2.5 µsec
φ
10
= 0 2 sp1: set for 100-130 kHz=cnst20 WPMLG: calculated from
cnst20=RF field
φ
31
= CYCLOPS, 0 1 2 3
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