Protocol: Rocsa2d  Sequence: rocsa2d.c  Apptype: solidseq1d

Description: 

        A 2D homonuclear correlation whose cross-peak intensities
        are modulated by the CSA and the X-H dipole interaction. 
        Uses R1852 to recouple the CSA, Lee-Goldburg decoupling to
        to recouple the X-H dipole interaction and RFDR for mixing. 

Additional Software

   reset_rocsa2d - This macro calibrates R18 based on the current spin
        rate and the X calibrations, calibrates LG based on the H
        calibrations, calibrates RFDR and sets up for 2D.  

Parameter  Groups: 

90H:  Module:  no
Sequence:  tancpx.c  
Description:  Provides a 90-degree pulse on dec that can be used 
              as a preparation pulse. Also used to store the dec 
              calibration.
Parameters:  Channels Page
       aH90  - the amplitude of the pulse.
       pwH90 - the pulse length.

cpHX:  Module:  yes
Sequence:  tancpx.c
Description:  Implements constant, linear or tangent-ramped cross 
              polarization from dec to obs. 
Parameters:  Sequence Page
       shHX - 'c', constant, 'l', linear and 't', tangent shape on
               the channel designated with chHX. 
       chHX - the variable-amplitude channel, 'fr' from or 'to', to. 
       aHhx - median amplitude of the dec channel.
       aXhx - median amplitude of the obs channel.
       bHX -  +/- tangent curvature (>0 to 1.0e5).  
       dHX -  amplitude width of the ramp. A negative width sets a
              ramp that starts high and decreases in amplitude.
       tHX -  contact time
       ofHX - overall offset on the variable channel
       frHX = 'dec' -  channel with the initial polarization (must 
              be set - not shown).           
       toHX = 'obs' -  channel with the final polarization (must be
              set - not shown). 
Implementation:  CP hx = getcp("HX",0.0,0.0,0,1); 
Underscore functions: _cp_(hx, phHhx, phXhx);  
 
r18X:  Module:  yes 
Sequence:  rocsa2d.c    
Description:  Implements the R1825 recoupling sequence on the obs 
              channel.
Parameters:  Sequence Page
       aXr18 - amplitude of dec pulses.
       pwXr18 - 360-degree flip on obs.
       qXr18 - R18 cycles represented in the .DEC file. 
       ofXr18 - overall frequency offset.
       chXr18 = 'obs' must be set (not shown).
Implementation: MPSEQ r1825 = getr1825("r18X",0,0.0,0.0,0,1); 
Underscore functions: _MPSEQ functions.  

rfdrX:  Module:  yes
Sequence:  rocsa2d.c
Description:  Implements RFDR with a single pi pulse per rotor period
              and an XY8 phase cycle.
Parameters:  Sequence Page
       aXrfdr - amplitude of dec pulses.
       pwXrfdr - 360-degree flip on obs.
       qXrfdr - RFDR cycles represented in the .DEC file. 
       ofXrfdr - overall frequency offset.
       chXrfdr = 'obs' must be set (not shown).
Implementation: MPSEQ rfdr = getr1825("rfdrX",0,0.0,0.0,0,1); 
Underscore functions: _MPSEQ functions.  

lgH:  Module: yes 
Sequence:  rocsa2d.c      
Description:  Implements cw decoupling with an offset, used for 
              Lee-Goldburg decoupling. 
Parameters:  Sequence Page
       aHlg - amplitude of the FSLG dec pulses.
       qlg - FSLG cycles represented in the .DEC file.       
       oflg - overall frequency offset.
       chHfslg = 'dec' must be set (not shown). 
Implementation: MPSEQ lg = getlg("lgH",0,0.0,0.0,0,1); 
Underscore functions: _MPSEQ functions.  

aXlgref: (parameter) the amplitude of the X refocussing pulse
       in the LG interrupted decoupling.  
pwXlgref: (parameter) the pulse width of the X refocussing 
       pulse in the LG interrupted decoupling. 
tXlgref: the time for Lg interrupted decoupling. 

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);   
