Quadrupole mass spectrometer

NAME
Wire the QMS to the data acquisition set-up
Set up the QMS.
Start the measurement.
Adjust horizontal and vertical scales in CONTROL.
Compare with reference mass spectra.
Make a plot on the laser printer.
Some final remarks.

QUADRUPOLE MASS SPECTROMETER

June 12, 2000

Directions for using the quadrupole mass spectrometer at the soft-landing set-up.

Wire the QMS to the data acquisition set-up

Connect ELECTROMETER 0-10 V (cable A5) to ADC 1.
Connect the RESET SCAN (cable B5) to INTERNAL GATE OUT.

Set up the QMS.

Set FIRST MASS to 1.
Set SCAN WIDTH to 100.
Set SCAN SPEED to 0.3 s.
Set SCAN to 'START'.
Set MODE to 'SINGLE SPECTRUM'.

Start the measurement.

Start the OLIVETTI.
Type cd c:\cntr
To start the data-acquisition programype, type
```
    control
```
Type next
```
    xct qms
```
This sets up CONTROL and then starts the measurement by triggering the QMS.
Press F10 to toggle between text and graphics display.

Adjust horizontal and vertical scales in CONTROL.

Turn off live display by pressing F7.
Scale up/down the y-scale with the keys +/-.
Move the marker to the current spectrum with the keys UpArrow/DnArrow.
Move 'marker 3' with the keys LftArrow/RgtArrow to the position where you want to set 'marker 1' and press F1.
Move 'marker 3' to the position where you want to set 'marker 2' and press F2.
Toggle between full and expanded display by pressing F8.
See also the Hot Key Reference Card at your keyboard.

Compare with reference mass spectra.

Type command
```
    open 1 massspec.ref
```
Type next
```
    get specnr 1 runnr
```
Here specnr (= [0, 2..7]) refers to the spectrum area in CONTROL where you want to put your reference spectrum, and runnr refers to the run number of the spectrum you want to read from file.

Compare spectra by using one of the following commands:

    command         result

    ADD A B C       C[i] = A[i] + B[i]
    SUB A B C       C[i] = A[i] - B[i]
    MULS A B C      C[i] = A[i] * B[i]
    DIVS A B C      C[i] = A[i] / B[i]
    ADDC A B z      C[i] = A[i] + z
    MULT A B z      C[i] = A[i] * z

Here A,B,C are spectrum numbers and z is a real number.

View the result by typing command
```
   ldis C 1
```

Make a plot on the laser printer.

Type the following command sequence:

    open 1 qmsspec.dum     (open a dummy file)
    run 1                  (reset the run number to 1)
    wrt 1 1                (write spectrum #1 to file)
    stop                   (quit program CONTROL)

Start program FTP on the OLIVETTI by typing

    ftp nvsf1

    cd ../qms              (change to the right directory)
    put qmsspec.dum        (transfer the file to nvsf1)
    quit                   (quit program FTP)

Delete dummy spectrum on the OLIVETTI by typing command
```
    del qmsspec.dum
```

Start program TELNET on the OLIVETTI by typing

    telnet nvsf1

    cd ../qms              (change to the right directory)
    qmsplot                (this script translates the file
                           qmsspec.dum to pctl format,
                           executes pctl and sends the plot
                           result to the laser printer;
                           note that script qmsplot only
                           reads the first spectrum with
                           run number = 1 on the file
                           qmsspec.dum)
    exit                   (logout)

Program pctl puts the OLIVETTI in graphics display mode. If you don't like that, press the key SCROLL-LOCK to switch back to alpha-numeric display mode.

Some final remarks.

The following programs and scripts are assumed to exist:

on OLIVETTI: control, ftp, telnet, and qms.pro. The latter should be located in the directory c:\cntr.
on nvsf1: c2p, pctl, geppost, qmsplot, qms.pro, geppin, and runpctl. The last 4 files should be located in the directory where you run qmsplot.