Portwell, Inc.
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Detection of Positive and Negative Ions with Capability of Measuring Large Proteins – Electron Multiplier R6985-80
When positive ions strike the conversion dynode it emits electrons in proportion to the quantity of input ions. The resulting electrons are then directed into the electron multiplier for secondary multiplication.
When negative ions strike the conversion dynode it emits positive ions in accordance with the amount of input ions. The resulting positive ions are then guided into the electron multiplier, where they receive energy from the variation in potential between the electron multiplier and conversion dynode and strike the electron multiplier’s first dynode, releasing electrons in proportion to the quantify of input positive ions. The emitted electrons are then directed to the second and successive dynodes for secondary multiplication.
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Specifications
General
| Parameter | Description / Value | Unit |
|---|---|---|
| Input Aperture Diameter | F11 | mm |
| Dynode Structure | Conversion + box and linear focused | — |
| Number of Dynode Stages | 19 | — |
| First Dynode Material | Al2O3 | — |
| Total Built-in Resistance | 17.15 | MO |
| Operating Ambient Temperature | -30 to +50 | °C |
| Storage Temperature | -80 to +50 | °C |
| Polarity of Detected Ions | Positive / Negative | — |
Maximum Ratings
| Parameter | Value | Unit |
|---|---|---|
| Anode to First Dynode Voltage | -3000 | V |
| Anode to Last Dynode Voltage | 350 | V |
| Conversion Supply Voltage | ±10 | kV |
| Operating Vacuum Level | 1 x 10-2 | Pa |
| Bake-Out Temperature (at 5 x 10-3 Pa) | No baking | — |
| Average Anode Current* | 10 | µA |
| Operating Gain | 1 x 108 | — |
Characteristics
| Parameter | Value | Unit |
|---|---|---|
| Recommened Supply Voltage | -1900 | V |
| Gain (Typ.) | 1 x 106 | — |
| DC Linearity (Typ.) | 5 | µA |
| Dark Current (Max.) | 1 | PA |
| Rise Time (Typ.) | 4.5 | ns |
| Anode to All Other Electrode Capacitance | 1.8 | pF |
NOTE: * Averaged over any interval of 30 seconds maximum. Figure 2: Dimensional Outline (Unit: mm)
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