1. PHOTONIS USA Resistive Glass Capillary Inlet Tubes

2. Background
Resistive Glass Products are geometric glass structures with resistive properties that can be used to create uniform electric fields in order to guide or direct charged particles
They are fabricated from proprietary lead silicate glasses and can have thin film metallization contact points

3. Capillary Inlet Tube Illustration
Electroded end
(beveled)
Resistive Glass
Conductivity break on outside of tube

4. Capillary Inlet Tubes Key application for RGPs
Sample injection in mass spectrometers
Voltage applied across resistive glass tubes creates an electric field that
Preferentially attracts ions into inlet tube and rejects ambient species
Forces more ions into the mass spec
Sample Chamber
(ambient pressure)
Mass spec (vacuum) E + +

5. Capillary Inlet Tubes
Otherwise collisions with other ions and tube walls may result in ions traveling back
Therefore, compared to conventional quartz tubes resistive glass inlets provide more efficient sample transfer without analysis of unwanted background
Sample Chamber
(ambient pressure)
Mass spec (vacuum) E + +

6. PHOTONIS USA manufacturing capability:
A leading mass spec manufacturer currently uses our inlet tubes in their LC/MS Q-TOF
Planning to implement resistive glass inlet tubes across entire line of mass spectrometers
PHOTONIS USA manufacturing capability:
+/ mm tolerance on OD and ID
Custom end designs to accommodate specific cap configurations
Custom electroding and sandblasting patterns

7. Properties of PHOTONIS USA Resistive Glasses
Resistance Uniformity:
1.5 to 2.5% variation in resistance of flat plates of various sizes
Less than 1% variation in resistance of tubes of 30mm length.
Kelvin probe data indicates uniform resistance results in uniform electric fields and the glass acts as a good conductor with no surface charging.
Resistance Stability :
Tubes are very stable in vacuum and nitrogen
Moderate increase in resistance observed in room air over time
The rate of increase slows with time but the resistance has been seen to continue to increase for over 6 months
Resistance also decreases at elevated temperatures