PROBLEM TO BE SOLVED: To provide a flow cell having improved sensitivity while reducing a position distribution spread of a sample, by contrivance of a flow structure.;SOLUTION: The long light-path-length flow cell includes a first tubular duct 104 and a second tubular duct 105 in which measurement light passes. The first tubular duct and the second tubular duct have such a shape that the cross sectional area orthogonal to an incident optical axis is constant or continuously increases in the traveling direction of the incident light. The cross sectional area in the light emission end of the first tubular duct is less than or equal to the cross sectional area in the light incidence end of the second tubular duct. A sample is introduced from a fluid introduction part 106 into the first tubular duct and the sample passing though the second tubular duct is discharged from a fluid discharge part 107. Preferably, the duct cross sectional area of the fluid discharge part is larger than the duct cross sectional area of the fluid introduction part, and a flow cell body 101 is formed of a material preventing the reflection of the light from an ultraviolet wavelength region to an infrared wavelength region.;COPYRIGHT: (C)2013,JPO&INPIT
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