Our Material Science Research Lab have Angstrom UV1900 Double beam spectrophotometer. We can measure Absorption and Transmission of sample (solution or thin film) in the range of 190 nm - 1100 nm. Specification of Spectrophotometer available in Material Science Research lab, college of Science, Al-Zulfi is given below-

UV 1900 Specifications
Wavelength range	190-1100nm
Wavelength accuracy	±0.3nm
Wavelength Repeatability	≤0.2nm
Range of Transmittance	0~99.9%T
Range of Absorbability	-3.000~3.000A
Transmittance Accuracy	±0.3%T
Transmittance Repeatability	≤0.1%T
Drift	<=0.0004A/h (2 hours after turn-on, at 500nm)
Straightness of Base Line	≤±0.001A(200~1100nm)
Stray Light	≤0.03%T (220nm NaI, 360nm NaNO2)
Noise	100%Line Noise =0.3T;0% Line Noise=0.1%T
Scanning Speed	Fast             Middle            Slow
Spectrum Bandwidth	2 nm
Dimensions	650mm×450mm×220mm
Weight	25 kg

The spectrophotometer is a routinely used instrument in scientific research. Spectrophotometry is the quantitative measurement of how much a material absorbs light by passing a beam of light through the sample using a spectrophotometer. The word ‘spectroscopy’ is used as a collective term for all the analytical techniques based on the interaction of light and matter. Absorption or emission of photons occurs when a molecular system undergoes transition between energy states. A graph of absorbance against wavelength gives the sample’s absorption spectrum (as shown below)

The general layout of a UV-visible spectrometer is shown in next figure below. The intensity of the reference beam, which should have suffered little or no light absorption, is defined as I₀. The intensity of the sample beam is defined as I. Over a short period of time, the spectrometer automatically scans all the component wavelengths in a systematic manner.The absorption of UV or visible radiation corresponds to the excitation of outer electrons.