The MCD.3 accessory mounts directly into Chirascan's sample housing chamber and does not require further alignment or optimisation. The position of the circular dichroism (CD) Detector can be easily moved along the optical axis and, for MCD measurements, it is set further back from the sample cell. Switching between CD and MCD detection modes is straightforward and takes less than 5 minutes. The field strength at the sample position is > 0.95 Tesla.

MCD.3 Magnetic Circular Dichroism accessory mounted in a Chirascan sample chamber

The spectra (right) show Magnetic Circular Dichroism (MCD) spectra of Cyctrochrome C (blue and red traces). The scans are raw MCD data collected in 7 minutes - no smoothing (or filtering) has been applied. The average of these spectra (green trace) should in theory be the non-magnetized CD spectrum under these conditions.

The average MCD spectrum (green trace - left) is compared here with the measured CD spectrum of the same sample with the magnet removed (red trace). As can be seen, these spectra are virtually identical, underlining the accuracy of the MCD measurements.

The same MCD spectra are shown here after subtraction of the non-magnetized component from both. As would be expected from theory, these spectra are perfectly symmetrical about the X axis.

Specification