The UHV point sources are heating elements designed as a single evaporator or for self-assembly of a cluster evaporator.
The heads are made of quartz glass, Al2O3 or sapphire and allows a temperature range from 20°C to 1500°C.
The heating head can be shielded to reduce the energy consumption.
The crucibles for use with Q5, A5 and S5 have a size of 15mm length and 5mm outer diameter. The crucibles for Q3 and S3 have a 15mm length and 3mm outer diameter. In combination with a double shield, aperture crucibles can be inserted.
Due to the choice of material, the sources have very low degassing and allow very clean preparation.
They can be easily removed in combination with a unit plug.
UHV point sources Q5 and Q3
Made of quartz glass and Macor®
Temperature range from 20°C to 950°C allows the preparation of most (UHV stable) organic molecules an some inorganic like NaCl.
Heater head consisting only of quartz glass and tungsten (apart from a small ceramic fixing of the thermocouple and filament).
The advantage of the Q5/Q3 version is the low power consumption, fast temperature response, and low degassing (hydrogen degassing of the quartz glass is reduced due to tempering under UHV conditions).
UHV point source A5K and A5C
Made of Al2O3 with different thermocouple
The design allows a higher temperature 20°C -1250°C (A5K) and 50°C-1500°C (A5C).
The advantage of the A5K/A5C is an improved follow-up temperature inside the crucible in relation to the temperature of the evaporator.
It can be supplied with different filaments to match a specific power supply.
In most cases, the use of quartz glass crucibles is recommended.
UHV point source S5 and S3
Made of sapphire and titanium
Temperature range from 20°C to 1250°C allows the preparation of organic molecules and some inorganic materials.
The properties of the sapphire guarantee very low temperature gradient of the heating element and crucible.
This curve shows the fast temperature decay without cooling.
Socket for connecting the point source with a power supply. Only the point source A5C requires a different connection socket due to the other thermocouple.