Photoionization detector ultraviolet lamp

A method of forming an ultraviolet lamp for use with a photoionization detector, the method comprising:

• applying at least one layer of a coating onto an inner surface of a sealed tube, wherein the coating comprises at least one of an anti-sputtering material, a material that generates a second electron emission, and a material with strong reflection of UV light;
• sealing a crystal window onto the sealed tube;
• filling the sealed tube with at least one gas;
• sealing the sealed tube containing the at least one gas;
• generating ultraviolet radiation using the at least one gas within the sealed tube;
• and
• directing the generated ultraviolet radiation through the crystal window toward a sample gas in the photoionization detector.

A photoionization detector comprising:

• one or more electrodes;
• an ultraviolet lamp comprising:
• a sealed tube configured to contain at least one gas;
• a coating applied to the inner surface of the sealed tube;
• and
• a crystal window attached to the sealed tube, configured to allow transmittance of ultraviolet light into the sealed tube;
• and
• at least one sample gas,
• wherein:
• ultraviolet radiation is generated within the sealed tube by ionizing the at least one gas,
• the coating reflects the ultraviolet radiation, and the reflected ultraviolet radiation is directed toward the sample gas,
• the sample gas is at least partially ionized by the reflected ultraviolet radiation, and
• the electrodes are configured to detect the electric current produced by the ionization of the sample gas to determine a concentration of the sample gas.