What's new in 2006
December 8, 2006:
SPAM echo/antiecho pulse program from Bruker is described.
December 5, 2006:
Mathematica-5 notebooks and SIMPSON1.1.1 Tcl scripts are provided for the simulation of echo and antiecho amplitudes in MQMAS NMR: amplitude-modulated two-pulse and phase-modulated shifted echo sequences.
November 21, 2006:
Two types of pulse program for shifted echo sequences are provided: those with three strong pulses and those in which the last pulse is a selective pulse. The phase cycling for the third pulse and the receiver also differ in these pulse programs. Strong pulses allow a better excitation of off-resonance spins.
September 26, 2006:
In the topic about quadrupole interaction, Mathematica notebooks and SIMPSON Tcl scripts are provided that simulate the soft pulse added mixing (SPAM) and z-filtered MQMAS of 27Al.
June 16, 2006:
In the topic about quadrupole interaction, Mathematica notebooks and SIMPSON Tcl scripts are provided that simulate the central line intensity of 23Na for pulse duration t increasing from 0 to 20 µs by steps of 1 µs. 23Na is a spin I = 3/2 rotating at the magic angle, excited by an x-pulse and submitted to the first and second orders quadrupole interaction.
The discussion is centred on the effects of the sign of the asymmetry parameter on the line intensity. A method is proposed that allows both Mathematica notebook and SIMPSON Tcl script to provide the same results for powder samples, independent of the convention used to define the asymmetry parameter.
May 18, 2006:
The site applies CSS without table for its presentation. As a result, the pages appear differently in different Web browsers.
With Netscape 4.7, the site appears without style, in pure html presentation.
With Internet Explorer 5 for Mac, the submenu for downloading applet source code is not available. The following URLs should be used:
- http://www.pascal-man.com/JDK1.1.8-download/download-jdk.shtml for JDK1.1.8 applet source code;
- http://www.pascal-man.com/download/download-jdk.shtml for JDK1.0.2 applet source code.
February 22, 2006:
A new topic about quadrupole interaction is introduced. The first contributors are Y. Millot and R. Hajjar.
February 17, 2006:
SIMPSON Tcl scripts are available for simulating and fitting the central-line intensity of a spin I = 3/2 in single crystal excited by the composite-pulse sequence, the first-pulse length being variable and the other two constant.
Due to different conventions for the definition of the asymmetry parameter used in SIMPSON and the Java applets, these two approaches provide different simulations. Fortunately, as proposed by Klaus Eichele, if we add 90° to alpha, the first Euler angle in SIMPSON Tcl scripts, these two approaches give identical results.
January 30, 2006:
Carr-Purcell-Meiboom-Gill (CPMG) echo train pulse program for Avance AQX NMR spectrometers with HADC digitizer and analog filtering is provided by Y. Millot.
January 18, 2006:
Carr-Purcell-Meiboom-Gill (CPMG) echo train pulse programs for Avance AQX NMR spectrometers are provided by Y. Millot: