Spectrophotometer

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.








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Announcment

Welcome to the Second semester 2017-2018

Dear Students, visit my homepage frequently for any update regarding your course.

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Final Exam for Electromagnetism Lab: 23/04/2018

Final Exam for General Physics 1 Lab: 25/04/2018

Midterm 2 for General Physics 1: 23/04/2018

Midterm 2 for Electromagnetism 1: 24/04/2018


Final Exam for Electromagnetism 1: 20/08/1439 (10:30-12:30)

Final Exam for General Physics 1:22/08/1439 (08:00-10:00)

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email: [email protected]

Office Phone: +966164044170

Extension : 4170

S-159, Second Floor

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