Q150T Sample Preparation System
10473 - Issue 5
34
Q150T - Instruction Manual
5.6
Pulsed Rod Evaporation
Use this process for preparing TEM coatings for applying carbon reinforcement layers
onto formvar grids. It is only available with Q150T E/ES models.
5.6.1
How to create a conductive layer for SEM
1.
Install the carbon insert as described on page 54. Ensure that the carbon rods are
prepared with a 1.2mm diameter spigot correctly as described on page 56.
2.
Ensure the stage is fitted with a shorter support shaft to give the maximum source-
to-stage distance.
3.
Create a new profile based on
QT Pulsed rod evaporation.
4.
Edit the newly created profile setting the parameters as shown in Table 7.
5.
Run the new profile.
6.
The thickness of coating can be varied by adjusting the stage height, raise the
stage to increase thickness, lower to reduce.
Table 7
QT Pulsed rod evaporation parameters for conductive layer for SEM
Parameter
Value
Material
Carbon
Pulse Current*
62A
Pulses Length
3 seconds
Number of Pulses
1
Out Gas Time
10 seconds
Out Gas Current
40A
CAUTION: For pulsed rod evaporation, the recommended pulse current
range is 60-65A. Currents above this may activate the power supply
safety trip causing the unit to shut down.
Summary of Contents for Q150T E
Page 92: ......
