Protocol: Ssecho1d  Sequence: ssecho1d.c  Apptype: solidseq1d

Description: 

A two-pulse "solid" or "quadrupole" echo with a choice of SPINAL64 or 
TPPM decoupling. Used primarily for wide-line deuterium NMR. 

Setup: 

Load a calibrated data set and select the protocol Ssecho1d. For a new 
nucleus calibrate with Onepul and then select Ssecho1d.  

Select the desired decoupling method, TPPM or SPINAL. The manual file 
onepul describes calibration of decoupling. 

Set aXecho = aX90 and pwXecho = pwX90.

Set t1Xecho and t2Xecho to create an echo delay.  It is helpful to set 
t2Xecho < t1Xecho and use lsfid to set the top of the echo as the first 
point of the fid. If using MAS be sure t1Xecho + pwXecho/2.0 = n/srate 
where n is an interger. 

Parameter Groups: 

90X:  Module:  no
Sequence:  onepul.c    
Description:  Provides a 90-degree pulse on obs that can be used as a 
              preparation pulse.  Also used to store the obs calibration.
Parameters:  Channels Page
      aX90  - the amplitude of the pulse.
      pwX90 - the pulse length.

echoX: Module: no
Sequence:  ssecho1d.c
Description: Implements a refocusing pulse with delays before and after 
the pulse.
Parameters:  Sequence Page
       aXecho - amplitude of the obs pulses. 
       t1Xecho - delay before the refocusing pulse. 
       pwXecho - 180-degree flip on obs. 
       t2Xecho - delay after the refocusing pulse. 

Hseq:  Module:  yes 
Sequence:  tancpx.c      
Description: Chooses SPINAL or TPPM decoupling on the dec channel 
             during acquisition.
Parameters:  Sequence Page - the Hspinal and Htppm groups overlap.
       Hseq - chooses the decoupling sequence, TPPM or SPINAL. 
Implementation:  DSEQ dec = getdseq("H");  The router implements 
             getspinal() or gettppm(). 
Underscore functions: _dseqon(dec); runs _tppm(); or _spinal();_
             dseqoff(dec); runs decprgoff();  

Hspinal:  Module:  yes 
Sequence: tancpx.c  
Description:  Implements SPINAL decoupling on the dec channel during 
              acquisition.  
Parameters:  Sequence Page
       aHspinal - amplitude of the dec channel. 
       pwHspinal - approximate 180-degree flip angle on resonance. 
       phHspinal - +/- small angle phase. SPINAL64 is implemented 
              with phases = +/- 1.0, +/- 1.5 and +/-2.0 times 
              phHspinal. 
       chHspinal = 'dec' must be set (not shown).
Implementation: SPINAL dec = getspinal("H"); or DSEQ dec = 
              getdseq("H");  
Underscore functions: _spinal(dec); and decprgoff(); or 
             _dseqon(dec); and _dseqoff(dec);   

Htppm:  Module:  yes 
Sequence:  tancpx.c      
Description:  Implements TPPM decoupling on the dec channel during 
              acquisition.  
Parameters:  Sequence Page
       aHtppm - amplitude of the dec channel. 
       pwHtppm - approximate 180-degree flip angle on resonance. 
       phHtppm - +/- small angle phase. TPPM is implemented 
              with phases = +/- 1.0 times phHtppm for alternating 
              pulses.  
       chHtppm = 'dec' must be set (not shown).
Implementation: TPPM dec = gettppm("H"); or DSEQ dec = getdseq("H");   
Underscore functions: _tppmon(dec); and decprgoff(); or _dseqon(dec);
              and _dseqoff(dec);   
