1. Program Design for REMPI Jingming Long 08/02/2010

2. Content  Device controlling program  Data processing program

3. Device controlling program Computer Dye Laser(Scanmate) Doubling crystal(Autotracker) Oscilloscope Excimer Laser Independent Integration Trigger Lecroy Tektronix

4. Scanmate module Trigger on or off Go to wavelength Set grating order Start /Stop scanning

5. Autotracker module Find maximum value Get intensity graph Set parameters Autotrack

6. Oscilloscope module Get experimental data Set mode of data record One Byte for Y axis, 500 points for X Two Bytes for Y axis, 10,000 points for X Two Bytes for Y axis, 500 points for X One Byte for Y axis, 10,000 points for X Display in real time when adjust light About spectral resolution and data acquisition speed

7. Resolution and speed Oscilloscope window (0, 65535)(9999, 65535) (9999, 0) (0,0) EXT trigger signal Delay time Mass spectra Y X (X,Y) is the position of oscilloscope window Why the maximum value of Y is 255 or 65535? and why the maximum value of X is 500 or 10000? Decided by bit-count of record Decided by sampling rate and memory

8. Understand data structure A bit alternatives 0 and 1 A byte is the smallest addressable unit of data and has 8 bits generally A word is the unit processed by machine code instructions In general, a word = 2, 4, 8bytes according to operation system 00000011 128 64 32 16 8 4 2 1 2 7 2 6 2 5 2 4 2 3 2 2 2 1 2 0 =3 Binary: 10010000 Low byte High byte 2 15 2 14 …....……2 9 2 8

9. Data save A.txt file as one wavelength step A folder as one experiment Each data file by named value of wavelength Like 20045.1.txt, 20045.2.txt…

10. For example, there are three experiments on HCl Scan range of wavelength as follow: 1.20000~20050cm-1 2.20045~20080cm-1 3.20075~20100cm-1 wavelength mass File a H + File b File c …… File 1File 1000

11. Old program: Three files will be saved. If we want to get a spectroscopy from 20000cm-1 to 20100cm-1, We have to match them with each other difficultly. New program: It’s easy to merge data of different experiment, because we Only choose one group of the overlapped data to plot a curve. Comparison: Main devices are controlled by computer, It’s convenient to operate.

12. Data processing program Merge file as we want Plot 2D spectroscopy Auto mark the mass

13. Thank you!