Patent ID: 7250098

Claim:
A device comprising: a plurality of capillaries filled with a separation medium, each capillary of the plurality having a respective first portion into which a sample can be introduced, and a light-irradiatable portion that is capable of being irradiated with excitation light; a vessel that includes a first flat-plate part on which a plurality of the light-irradiatable portions are arranged in a row, and a second flat-plate part, the vessel holding a liquid having a refractive index that is higher than the refractive index of air and lower than the refractive index of water, in areas between two or more adjacent light-irradiatable portions, and wherein the light-irradiatable portions are disposed in a space between the first flat-plate part and the second flat-plate part; a power supply capable of supplying a voltage to a current path that includes the first portions and the light-irradiatable portions; an excitation light source capable of emitting excitation light that passes through the plurality of light-irradiatable portions; a detector capable of detecting light that is emitted by samples in the light-irradiatable portions upon excitation with excitation light; and a temperature control unit to control the temperature of the first flat-plate part to be higher than the temperature of the second flat-plate part.