Chirascan™ Circular Dichroism Spectrometer

Key Features and Benefits

Unique dual-polarizing optics
Dual-polarizing optics mean that excellent polarization extinction is achieved without recourse to Brewster clean-up plates or the need for a post-monochromator polarizer. Dual-polarizing optics also mean that greater separation of ordinary and extraordinary beams is achieved. In turn, this greater separation gives access to broader bandwidths across the whole wavelength range because the slits can be opened wider without contamination of one polarised state with the other. It is of particular benefit in the far-UV where light is at a premium and wavelength dispersion is high. Slits can be set at up to 4nm bandwidth at 180nm.

High-throughput F/7 monochromator
The F/7 monochromator uses as small an F-number as is compatible with high image quality to maximise light throughput from a given source. The results in terms of light throughput are truly staggering. The Chirascan provides well in excess on an order of magnitude more light than its nearest rival at 180nm and 1nm bandwidth.

High magnification optics
A large, homogeneous image of the arc is projected onto the entrance slit. Practice maps on to theory - when you double the slit-widths, you get four times the light throughput - right out to 4nm bandwidth at 180nm.

Hermetically sealed light-path
The hermetically sealed light-path eliminates wastage of purge gas and enables a highly efficient and therefore rapid purge to occur. . The volume of gas used to achieve and maintain purge is between five and ten times less than needed for other prism-based instruments. The reduction in through-life costs will amount to many thousands of dollars for an instrument in moderate use.

Fixed wavelength digital averaging
Measurements that are made at a series of fixed wavelengths using digital averaging eliminate the risk of distortion inherent in the use of electronic time constants. Chirascan is unique - it always collects unfiltered raw data because it is the only way of guaranteeing a true representation of the spectrum. All data operations such as smoothing, background subtraction and averaging are carried out after acquiring the raw data and are reversible. The results of such operations are saved in a separate file ensuring that your original data is never lost or damaged. The same cannot be said of other instruments where time constants and continuous scanning are routinely employed.

Simultaneous multi-channel data acquisition
Simultaneous multi-channel data acquisition ensures that all key information is recorded with every measurement you make. Instrument control and data presentation are handled by all-new PC software, which combines outstanding operational flexibility and ease of use.