Chirascan may be equipped with a nitrogen cryostat for low temperature CD measurements. The cryostat interfaces neatly with the Chirascan sample housing. The optimised thermal design provides excellent control and stability of the sample temperature.

The LT.3 cryostat is a top loading, static exchange gas cryostat. The sample is located in a central space surrounded by an exchange gas (typically nitrogen) providing extremely uniform cooling.

Changing the sample simply involves removing the sample rod maintaining overpressure of exchange gas, replacing the sample and inserting the rod back into the cryostat. There is no need to break the insulating vacuum and warm the cryostat up. The resulting sample change times are very short, typically a few minutes.

LT.3 Nitrogen Cryostat Accessory

Accessory Features

• 77K to 300K temperature range
• Temperature stability of ± 0.1K (10 minute period)
• 20min cool down time (ambient to 77K)
• Liquid nitrogen capacity 1.2L
• 15 hour cryogen hold period before refill is necessary
• 5 minute sample change time
• Sample holder dimensions: Width 19mm and height 30mm. Optical sample holder features a 15mm aperture