3Q MAS two-pulse program for Bruker MSL spectrometer
Contributor: J. Virlet
This is a pulse program for 2-dimensional 3Q-MAS experiment whatever the quadrupolar nuclei with half-integer spin I. The echo position is tau2 = k*tau1 where:
| I | 3/2 | 5/2 | 7/2 | 9/2 |
|---|---|---|---|---|
| k | 7/9 | 19/12 | 101/45 | 91/36 |
The delay tau1 should be very short, about 10 µs. The pulse lengths p1 and p2 must be optimized in order to obtain the biggest echo amplitude.
Pulse program
; VIRLETC.PC
; premiere partie de sequence 3Q commune 3Q+ et 3Q-
PROT ALL
LOOP C1 TIMES
10U ++PLS1
10U ++PLS2
END LOOP
START, D1 [F1 @PLS1 RGATE] : transfer to T33s Iy14
D4 [ RGATE]
D2 [F1 @PLS2 RGATE] ; transfer back to Iy23
D3 [STA RGATE]
D0 [++PLS1 ++PLS2]
GOTO START
BEGIN LISTS
PLS1, K0 (0/100) (0/) (30/) (30/)
(60/) (60/) (90/) (90/)
(120/) (120/) (150/) (150/)
(180/) (180/) (210/) (210/)
(240/) (240/) (270/) (270/)
(300/) (300/) (330/) (330/)
PLS2, K0 (0/100) (180/) (90/) (270/)
;Liste de phases pour 3Q+
RLS, X X -Y -Y -X -X Y Y
END LISTS
Acquisition AU program
;VIRLET.AUM
;AU program to use in conjunction with the VIRLETC.PC sequence
;to generate 2D MQ DAS Hypercomplex data sets.
;Interleaved simultaneous acquisition in the t1 dimension.
;SET NE TO NUMBER OF PAIR OF T1 POINTS, AND NF TO 2*NE
D4 = 4U
1 C1 = 0 ;Set C1=2 for cosine type echo.
ZE
GO
WR #1
IF #1
C1 = 1 ;Set C1=1 for sine type echo.
ZE
GO
WR #1
IF #1
I4 ;Increment t1=D4 and recycle
IN = 1
EXIT
[Contact me]
- Last updated May 14, 2011
Copyright © 2002-
pascal-man.com. All rights reserved.