Theory of Molecular Spectroscopy

Basic Theory of Molecular Spectroscopy

From the mid-1950s, JASCO has been researching and developing instruments and applications for some of the most important areas of molecular spectroscopy, including Fourier Transform Infrared (FTIR), Raman, fluorescence, UV-visible/near infrared, and chiral spectroscopy.

The evaluation of chirality has become an important area in molecular spectroscopy because it is used in the development of biomolecules that are useful as new medicines, and for materials that can be used in novel technologies for applications in material science. Chiral spectroscopy includes diverse techniques such as Optical Rotation Dispersion (ORD) and polarimetry, Circular Dichroism (CD) – both electronic and vibrational (VCD), as well as Circularly Polarized Luminescence (CPL).

  • FTIR Icon Colored Green FTIR Icon

    FTIR spectroscopy is concerned with the vibration of molecules that contain a dipole moment.

    FTIR Spectroscopy

  • ATR Colored Icon ATR Green Icon

    An FTIR ATR method may be a suitable alternative and offers advantages such as minimal sample preparation, non-destructive measurement, and easy handling.


  • Colored IRT Icon Green IRT Icon

    FTIR microscopy is ideal for imaging materials using functional group(s), sample identification, multilayer film characterization, and particle analysis.

    FTIR Microscopy

  • UV Icon Color UV Green Icon

    UV-Visible/NIR spectroscopy can therefore be used for non-destructive measurements, such as determining the sugar, lipid, and protein content of food.

    UV-Visible Spectroscopy

  • CD Colored Icon

    Circular Dichroism (CD) spectroscopy is the essential analytical technique for probing structure of bio-macromolecules such as proteins and nucleic acids.

    Circular Dichroism Spectroscopy

  • FP Colored Icon FP Green Icon

    Fluorescence spectroscopy is used for studying structural changes in conjugated systems, aromatic molecules, and rigid, planar compounds.

    Fluorescence Spectroscopy

  • Colored Raman Icon Green Raman Icon

    This technique can be used for chemical or molecular analysis encompassing depth profiling and mapping of samples with spatial resolution as little as 1 μm.

    Confocal Raman Microscopy

  • VCD Icon VCD Icon

    Vibrational Circular Dichroism (VCD) is a spectroscopy technique that can probe the vibrations of chiral bonds using light in the infrared region.

    Vibrational Circular Dichroism

  • Circularly Polarized Luminescence (CPL) spectroscopy provides information about excited states.

    Circular Polarized Luminescence (CPL)