Model 654 Side-on Photomultiplier Tube (PMT) Housing Assembly
- Accepts side on PMTs up to 28-mm diameter
- Available with PMTs for 30 to 1100-nm
- Provides effective shielding against electrical noise
- Readily fits McPherson slit assemblies
- O-ring seals guarantee light tight operation
- Available with scintillator for work to 30-nm
- Linear detector from 30 to 300-nm
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The photomultiplier tube (PMT) is among the most popular photosensitive devices in use today. Various tube types and treatments permit use of these detectors from the Extreme Vacuum Ultraviolet (EUV) through the Visible and into the near Infra-Red. Featuring large photosensitive areas, secondary emission multiplication, low dark noise and fast time response - photomultipliers are ideal for a broad range of spectroscopy applications.
The Model 654 provides the user with a light tight housing for mounting 1 1/8" (28-mm) side-on type PMT's. The housing is equipped with RF shielding and has connectors for current output and high voltage (HV) input. Some models are equipped for VUV operation. All 654 assemblies are provided with a socket for a specified tube. Tubes are specified separately.
Choose the Model 654 for either atmospheric or vacuum use. Vacuum versions have scintillator equipped vacuum flanges for detection in the 30 to 300-nm region. The addition of a scintillation flange, allows the same PMT assembly to be used for many EUV and VUV applications. Ultraviolet radiation leaving the exit slit of the spectrometer passes directly to a sodium salicylate coated, vacuum tight window. The scintillator converts the impinging vacuum UV radiation to a VIS emission at about 420 nm. A conventional PMT is used to detect this secondary emission. The scintillator permits use over a broad wavelength range, about 30-nm in the extreme UV, to the Visible or near infrared cut-off of the PMT in use. Scintillator response in the 30 - 340 nm region is linear. The absolute quantum efficiency of sodium salicylate between 40 - 340 nm is approximately 65%.
The
Model 7640 is a suitable high voltage power supply for proper operation of this photomultiplier detector.
Part Numbers for the Model 654 Photomultiplier Tube (PMT) Housing Assembly
| Part Number | Description |
| 8105-0654-0 | Model 654 Atmospheric use - for 1 1/8" PMT's. Provided with a mounting flange fitting McPherson slits. Requires selection of PMT. |
| 8105-0654-1 | Model 654 Vacuum use - for 1 1/8" PMT's. Provided with a mounting flange fitting McPherson slits and a scintillator coated window for use in the vacuum ultraviolet. Requires selection of PMT |
| 8446-1003-0 | Replacement Sodium Salicylate coated window for Model 654 detector assembly. |
Frequently Used Photomultiplier Tubes (PMTs)
| Type |
Range, nm |
Peak, nm |
Max. Vdc |
Sensitivity, uA/lm |
Typ Amplification |
Rise Time |
Transit Time |
| 1P21 |
300 - 650 |
400 |
1250 |
40 |
3 x 10^6 |
2.2 ns |
22 ns |
| 1P28 |
185 - 650 |
340 |
1250 |
40 |
4.8 x 10^5 |
2.2 ns |
22 ns |
| R406 |
400 - 1100 |
730 |
1500 |
20 |
2 x 10^5 |
2 ns |
22 ns |
| R928 |
185 - 930 |
400 |
1250 |
250 |
1 x 10^7 |
2.2 ns |
22 ns |
| R955 |
160 - 900 |
400 |
1250 |
200 |
1 x 10^7 |
2.2 ns |
22 ns |
