Flash lamp with high irradiance

Flash lamp with high irradiance, comprising:

• a discharge vessel in which there is a pair of electrodes and which is filled with a gas which contains a rare gas, a region of the discharge vessel located between the electrodes having a part with a smaller diameter than an inside diameter of the discharge vessel in an area in which the cathode is located and
• a power supply adapted for operating the flash lamp with a full width at half maximum of the current of from 150 μs to 2 ms and a current density in the part with a small diameter of at least 2930 A/cm2,
• wherein a surface of the part with the smaller diameter which is in contact with said gas is formed essentially of a heat-resistant material, and
• wherein the rare gas is added at room temperature with a pressure from 7×102 Pa to 1.3×105 Pa and comprises krypton or a gas mixture with krypton as the main component.

Method of a producing photochemical change and detecting or determining DNA and amino acids, comprising producing a photochemical reaction in a sample using a flash lamp with high irradiance, the flash lamp comprising:

• a discharge vessel in which there is a pair of electrodes and which is filled with a gas which contains a rare gas, a region of the discharge vessel located between the electrodes having a part with a smaller diameter than an inside diameter of the discharge vessel in an area in which the cathode is located,
• wherein a surface of the part with the smaller diameter which is in contact with said gas is formed essentially of a heat-resistant material, and
• wherein the rare gas is added at room temperature with a pressure from 7×102 Pa to 1.3×105 Pa and comprises krypton or a gas mixture with krypton as the main component or is added at room temperature with a pressure from 1.3×103 Pa to 1.6×105 Pa and comprises xenon or a gas mixture with xenon as the main component, and
• further comprising the step of operating the flash lamp with power supplied with a full width at half maximum of the current of from 150 μs to 2 ms and a current density in the part with a small diameter of at least 2930 A/cm2, if the rare gas is krypton and a current density in the part with a small diameter of at least 2110 A/cm2 if the rare gas is xenon.

A method of heating a surface, comprising the steps of:

• positioning a flash lamp with high irradiance in the vicinity of a surface to be heated, the flash lamp with high radiation density, the flash lamp comprising:
• a discharge vessel in which there is a pair of electrodes and which is filled with a gas which contains a rare gas, a region of the discharge vessel located between the electrodes having a part with a smaller diameter than an inside diameter of the discharge vessel in an area in which the cathode is located,
• wherein a surface of the part with the smaller diameter which is in contact with said gas is formed essentially of a heat-resistant material, and
• wherein the rare gas is added at room temperature with a pressure from 7×102 Pa to 1.3×105 Pa and comprises krypton or a gas mixture with krypton as the main component or is added at room temperature with a pressure from 1.3×103 Pa to 1.6×105 Pa and comprises xenon or a gas mixture with xenon as the main component, and
• further comprising the step of operating the flash lamp with power supplied with a full width at half maximum of the current of from 150 μs to 2 ms and a current density in the part with a small diameter of at least 2930 A/cm2, if the rare gas is krypton and a current density in the part with a small diameter of at least 2110 A/cm2 if the rare gas is xenon.