X-ray Absorption Spectra in transmission
Cu foil
2019-01-31, step scanning (35 min/scan), 2 repeats, Si111 crystals, room temperature
Balder (green) compared to other beamlines (blue/orange)
![](https://www.maxiv.lu.se/wp-content/uploads/2022/09/XAS_XANES-1.png)
![](https://www.maxiv.lu.se/wp-content/uploads/2022/09/XAS_EXAFS-1.png)
2019-02-08, fly scanning (1 min 24 sec/full EXAFS scan), 35 repeats (not averaged)
Fly scan (orange) compared to step scan (blue). We are currently working on fine-tuning the fly scan performance. Presently, we can scan with a total accumulation time down to ~30 sec per full EXAFS. Notice a slight decrease in the 1st FT peak height. This is a result of ‘’running average” – a convolution of the real spectra with a rectangular broadening function given by the integration time duration (presently down to 1 ms). The user will eventually have control of this broadening at the expense of total scan time and S/N ratio.
![](https://www.maxiv.lu.se/wp-content/uploads/2022/09/cuFoilFly_mu.png)
![](https://www.maxiv.lu.se/wp-content/uploads/2022/09/cuFoilFly_chiFT2.png)
Copper oxide
2019-03-06, fly scanning (1 min 24 sec/full EXAFS scan) on CuO pressed 13 mm pellet (2 absorption length), focused beam (~6 x 1012 photons/sec) 30 scans on fixed spot, average of 1-15 (orange) and 16-30 (blue).
![](https://www.maxiv.lu.se/wp-content/uploads/2022/09/CuO_mu.png)
![](https://www.maxiv.lu.se/wp-content/uploads/2022/09/CuO_chiFT2.png)
Copper (II) sulfate in solution
2019-03-08, fly scanning (1 min 24 sec/full EXAFS scan) on 0.1 M CuSO4 (aq) in liquid cell with 1.5 mm path length, focused (100 µm2) versus defocused (h x v, 0.1 x 2 mm2) beam with a small step displacement before each new scan, average of 11 scans defocused (orange) and focused (blue).
![](https://www.maxiv.lu.se/wp-content/uploads/2022/09/CuSO4Fly_mu.png)
![](https://www.maxiv.lu.se/wp-content/uploads/2022/09/CuSO4_chiFT2.png)
Quick scanning EXAFS
under development, tested down to 4 Hz, results from commissioning fall 2022
Cu foil
![](https://www.maxiv.lu.se/wp-content/uploads/2023/02/Quick_XANES-1.png)
![](https://www.maxiv.lu.se/wp-content/uploads/2023/02/Quick_EXAFS.png)