Pressure vessel with high-pressure window

A pressure vessel (1) having a temperature measuring capability, said pressure vessel (1) comprises:

• a pressure vessel wall (1a) which completely surrounds a reaction chamber (2) as a pressure space for the initiation and/or promotion of chemical and/or physical pressure reactions of a sample (P) to be heated which is accommodated in the reaction chamber (2),
• wherein the pressure vessel wall (1a) has an infrared-permeable high-pressure window (30), which is configured to withstand pressures up to at least 200 bar, which extends away outward in a direction from the reaction chamber (2) and which is supported in the pressure vessel wall (1a) by a bore (31) which is open toward the reaction chamber (2) and comprises a step having an increased diameter to support the high-pressure window (30) with respect to a pressure in the reaction chamber (2),
• wherein the pressure vessel (1) furthermore has an infrared temperature sensor (40) which is situated directly opposite the high-pressure window (30), in order to measure the temperature of a sample (P), accommodated in the reaction chamber (2), during a pressure reaction through the high-pressure window (30).