High-pressure diffractometer

For structure studies under high pressure at low temperature (HP + LT) the pressure cell must fit in a cryostat and the pressure transmitting medium must not freeze or, if it does, must not produce a large uniaxial additional component. Several combinations of devices described in Sections IV.D.l and IV.D.2 are possible. While four-circle diffractometers have been often used for room-temperature and LT structural studies of organic conductors,... 

The molecular structure before irradiation is shown in Figure 5-6 [14]. A crystal in the diffractometer was cooled below 103 K and irradiated with a high-pressure mercury lamp for 20 min. The intensity data were collected at 103 K. The analyzed structure is disordered as shown in Figure 5-7. 

A crystal of l-I was mounted on an X-ray diffractometer and cooled below 80 K using the cold-nitrogen gas-flow method [15], The intensity data were collected and the structure was analyzed. The molecular structure of l-I is shown in Fig. 8.1. Then the crystal was irradiated with 365 nm light using a high-pressure Hg lamp in combination with a band-path filter at 80 K for 2 h. The intensity data were collected under the same conditions as those before the photo-irradiation. 

---