procurement of uv vis spectrophotometer with compatible optional thermoelectrical temperature controller (peltier) and appropriate cell holder (-10 to 100 0c or better) accessories , uv vis spectrophotometer with compatible optional thermoelectrical temperature controller (peltier) and appropriate cell holder (-10 to 100 0c or better) accessories , optical system: single monochromator, fully symmetrical double beam type light source: halogen lamp, deuterium lamp wavelength range:190 to 900 nm wavelength accuracy: +/-0.2 nm photometric range: -4~4 abs. or better stray light: 1 % (198 nm kcl 12 g/l aqueous solution), 0.02 % (220 nm nai 10 g/l aqueous solution) (or better)spectral bandwidth: 0.1, 0.2,0.5,1,2,5,10 nmscan speed : 10 ~ 4000 nm/min photometric accuracy: +/-0.0015 abs (0 to 0.5 abs), +/-0.0025 abs (0.5 to 1 abs),+/-0.3 %t tested with nist srm 930d (or better) photometric repeatability: +/-0.0005 abs (0 to 0.5 abs), +/-0.0005 abs (0.5 to 1 abs) tested with nist srm 930d (or better) rms noise: 0.00003 abs (or better) baseline stability: 0.0003 abs/hour (or better) baseline flatness: +/-0.0002 abs (200 - 1,000 nm) or better standard programs: abs/%t meter, quantitative analysis, spectrum measurement, time course measurement, fixed wavelength measurement, validation, two wavelength time course measurement detector: photomultiplier tube software: compatible software pc-system: desktop computer for operating instrument cuvette: pair of quartz cuvette warranty: three years compatible thermoelectrical temperature controller (peltier)andappropriate cell holder (-10 to 100 0c or better) and film holder for standard sample compartment