9) Depress depress and adjust sweep time with the knob on the “EMISS/(MA)”, “VAR”, left side of the panel. The display above the range keys shows the MS intensity, whereas the one above gives the mass number. “EMSS/(MA)” 10) SCAN WIDTH and SCAN CENTER can be set with their respective knobs, while being depressed and or being depressed (only one “EMISS/(MA)” “WIDTH” “MAN” switch pressed at a time). 11) Switching to yields a straight line on the scope. Mass number can be tuned “MAN” from 1 until 300 amu manually with the CENTER” knob. The height of the “SCAN baseline gives the intensity of the peak. To turn off MS safely - 1) Place the instrument in Faraday cup mode. 2) Set to 10-5 amp. 3) Turn the emission knob completely counter clockwise, to the point that the knob clicks off. 4) Release the emission switch. 5) Depress then depress “ON/STANDBY”, “OFF”. Optimized emission and voltages - Emission current: 1.71 mA ION ENERGY VOLTAGE: +15.1 V (default 15 V) FOCUS VOLTAGE: -30.0V (default -30 V) NEGATIVE ELECTRON ENERGY VOLTAGE: -56.1 V (default -55 V) POSITIVE ELECTRON ENERGY VOLTAGE: +15.1 V (default +15 V) Normal turn-on procedure in experiments - 1) Make sure chamber pressure is good. 2) Depress from “ON/STBY” “OFF”. 3) Set the amplifier range to 10-5 amps to start with. 4) Damper should be completely counter-clockwise to eliminate crosstalk between adjacent masses. 5) Depress Keep emission current the same for comparison between “Multiplier”. experiments. 6) Choose appropriate amplifier range and resolution setting for MS or TPD experiments. Normal turn-off procedure in experiments - 1) Depress from The UTI control unit can be left on “ON/STBY” “Multiplier”. mode if chamber pressure is maintained in UHV. “ON/STBY” 2) Depress from if chamber pressure significantly increases, e.g. “OFF” “ON/STBY” when venting chamber.
9) Depress “EMISS/(MA)”, depress “VAR”, and adjust sweep time with the knob on the left side of the panel. The display above the range keys shows the MS intensity, whereas the one above “EMSS/(MA)” gives the mass number. 10) SCAN WIDTH and SCAN CENTER can be set with their respective knobs, while “EMISS/(MA)” being depressed and “WIDTH” or “MAN” being depressed (only one switch pressed at a time). 11) Switching to “MAN” yields a straight line on the scope. Mass number can be tuned from 1 until 300 amu manually with the “SCAN CENTER” knob. The height of the baseline gives the intensity of the peak. To turn off MS safely - 1) Place the instrument in Faraday cup mode. 2) Set to 10-5 amp. 3) Turn the emission knob completely counter clockwise, to the point that the knob clicks off. 4) Release the emission switch. 5) Depress “ON/STANDBY”, then depress “OFF”. Optimized emission and voltages - Emission current: 1.71 mA ION ENERGY VOLTAGE: +15.1 V (default 15 V) FOCUS VOLTAGE: -30.0V (default -30 V) NEGATIVE ELECTRON ENERGY VOLTAGE: -56.1 V (default -55 V) POSITIVE ELECTRON ENERGY VOLTAGE: +15.1 V (default +15 V) Normal turn-on procedure in experiments - 1) Make sure chamber pressure is good. 2) Depress “ON/STBY” from “OFF”. 3) Set the amplifier range to 10-5 amps to start with. 4) Damper should be completely counter-clockwise to eliminate crosstalk between adjacent masses. 5) Depress “Multiplier”. Keep emission current the same for comparison between experiments. 6) Choose appropriate amplifier range and resolution setting for MS or TPD experiments. Normal turn-off procedure in experiments - 1) Depress “ON/STBY” from “Multiplier”. The UTI control unit can be left on “ON/STBY” mode if chamber pressure is maintained in UHV. 2) Depress “OFF” from “ON/STBY” if chamber pressure significantly increases, e.g. when venting chamber.