Overview
BL5-2 is a plane grating monochromator beam line optimized for high-resolution, micro-focused angle-resolved photoemission spectroscopy (ARPES) in the photon energy range of18 - 200 eV with full polarization control. The dedicated experimental end station is equipped with a SCIENTA DFS30 electron spectrometer. This system is capable of performing ARPES experiments with a total energy resolution of a few meV and an angular resolution of ~0.1°. It is also equipped with a low-temperature sample manipulator with three degrees of freedom of rotation, which can be cooled down to ~7 K.
Because BL5-2 and BL5-4 cannot operate simultaneously, they are often shown combined as BL5-2/BL5-4. BL5-2 is the default station for majority of the users on BL5. Please communicate with the responsible beam line scientists in advance if BL5-4 is the desired experimental station.
Source: 15-period undulator, 31-pole APPLE-II EPU, 0.65 mrad acceptance.
Status —
Beamline Parameters —
| Energy Range | Resolution ΔE/E | Spot Size | Flux | |
|---|---|---|---|---|
| Focused | 18 - 200 eV | ≥ 2.5 X 10-5 | 0.036(H) X 0.006(V) mm2 | ~ 2 X 1012 *@500 mA, 50 eV, E/ΔE = 10,000 |
Optics —
| M0 Mirror | M1 Mirror | M2 Mirror | Monochromator | M3 Mirror |
|---|---|---|---|---|
| horizontal deflecting, flat, water-cooled | horizontal deflecting, flat, water-cooled | vertical deflecting, flat, water-cooled | Variable Line Spacing Plane Grating Monochromator (VLSPGM)
|
Horizontal and vertical refocusing, elliptical toroidal |
Source —
Instrumentation —
| Detector | SCIENTA DFS30 Electron Analyzer |
|---|---|
| Manipulator | Low-temperature 6-axis Manipulator |
| Alkaline metal doser (K, Rb, Li) |
Sample Environment —
| UHV | < 3 X 10-11 Torr |
|---|---|
| Sample temperature | < 7 - 300 K |
| Sample size | < 10 X 10 mm2 |
| Annealing temperature | < 1000 °C |
