Absorption Spectroscopy

Absorbance spectroscopy is a molecular spectroscopy method that uses the wavelength dependent absorption characteristics of materials to identify and quantify specific substances. The absorbance of a solution increases as the attenuation of the optical beam increases.

Absorption spectroscopy works as an analytical chemistry tool that can determine if a particular substance is present in a sample and often also quantify how much of the substance is present. Infrared and ultraviolet-visible spectroscopy is particularly common in these kinds of analytical applications.

Especially for UV-VIS spectroscopy it is common to use the Beer-Lambert Law to calculate the concentration of a particular molecule from the measured absorbance.

There are many different approaches for measuring absorption spectra. The most common one is to point a generated beam of light at a sample and detect the intensity of the radiation that goes through it. The energy that is then transmitted is used to calculate the absorption.

 

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Absorption spectroscopy measurements

Products for Absorption spectroscopy

Ibsen Photonics offers a number of OEM spectrometer modules with the following distinct benefits for absorbance or absorption spectroscopy:

  • Large absorbance range due to low stray light
  • Low noise due to NMOS/InGaAs detector technology
  • Fast scans due to high throughput transmission gratings
  • Robustness for portability and field usage
  • Low temperature dependence

Here you can read more about how to obtain a large absorbance range and how to best select the right spectrometer for your absorbance instrument.

Below is a short list of spectrometer examples

Wavelength rangeProductsMin. ResolutionBenefits
UV-NIR
190 - 1100 nm
FREEDOM UV-NIR2 nmCompact
UV-VIS
190 - 850
FREEDOM UV-VIS1.7 nmCompact
UV
190 - 435 nm
FREEDOM UV
FREEDOM HR-UV
FREEDOM C-UV
0.7 nm
0.2 nm
Compact
Compact, high resolution
VIS
360 - 830 nm
FREEDOM VIS
FREEDOM HR-VIS
FREEDOM C-VIS
ROCK VIS
1.3 nm
0.4 nm
1.1 nm
Compact
Compact, high resolution
High sensitivity
VIS-NIR
475 - 1100 nm
FREEDOM VIS-NIR
FREEDOM HR-VIS-NIR
FREEDOM C-VIS-NIR
href="https://ibsen.com/products/oem-spectrometers/rock-spectrometers/rock-vis-nir/">ROCK VIS-NIR
1.7 nm
0.6 nm
2.5 nm
Compact
Compact, high resolution
High throughput
SW-NIR
815 - 1050 nm
ROCK SW-NIR2 nmHigh sensitivity
NIR
900 - 2200 nm
ROCK NIR
ROCK XNIR
6 nm
6 nm
High sensitivity
High sensitivity

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