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IR Spectrometers01:25

IR Spectrometers

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There are two main infrared (IR) spectrophotometers: dispersive IR spectrometers and Fourier transform infrared (FTIR) spectrometers. In a dispersive IR spectrometer, a beam of infrared radiation produced by a hot wire is divided into two parallel equal-intensity beams using mirrors. One beam passes through the sample, while another is a reference beam. The beams then move through the monochromator, which separates the radiations into a continuous spectrum of different frequencies. The...
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When electromagnetic radiation passes through a material, atoms or molecules transition from a lower to a higher energy state by absorbing radiation corresponding to the energy difference between the two states. The absorption of infrared (IR) radiation causes transitions between vibrational energy levels in a molecule. Therefore, IR spectroscopy is a useful analytical tool for determining the molecular structure of molecules.
Different compounds display unique properties due to their...
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Attenuated Total Reflectance (ATR) Infrared Spectroscopy: Overview01:13

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Attenuated total reflectance (ATR) infrared spectroscopy is a powerful analytical technique used to study the composition of materials. It is widely employed in chemistry, materials science, forensic science, and other fields where sample characterization is required. ATR has several advantages over traditional transmission IR spectroscopy, including the requirement of little to no sample preparation and the ability to analyze a wide range of samples.
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The non-destructive nature and ability to provide valuable chemical information make IR spectroscopy a versatile technique with broad applications in various scientific and industrial fields. IR spectroscopy is commonly used to identify and characterize organic and inorganic compounds. It provides information about the functional groups present in a molecule and the bonding between atoms. This helps in the structural elucidation of compounds during organic synthesis, pharmaceutical research,...
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High-Resolution Mass Spectrometry (HRMS)01:15

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The resolution of a mass spectrometer depends on the efficiency of separating ions with different ion masses. The mass of an atom is approximated to the sum of the masses of protons and neutrons inside, considering the masses of protons and neutrons as equal. However, the masses of the proton (1.6726 × 10−24 g) and neutron (1.6749 × 10−24 g) are not truly equal. There is a minor error in the expression of atomic masses relative to the simplest atom of hydrogen. For...
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IR Spectrum01:19

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When infrared (IR) radiation passes through a molecule, the bonds stretch or bend by absorbing the radiation. This absorption creates the molecule's absorption spectrum, which is the plot of its percentage transmittance versus wavenumber.
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High resolution imaging with differential infrared absorption micro-spectroscopy.

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    This study introduces a novel method for high-resolution infrared chemical imaging. By using patterned light, it overcomes diffraction limits, enabling detailed vibrational absorption mapping.

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    Area of Science:

    • Optics
    • Spectroscopy
    • Chemical Imaging

    Background:

    • Confocal infrared (IR) absorption micro-spectroscopy is limited by diffraction, restricting spatial resolution.
    • Below-the-diffraction limit fluorescence microscopy techniques demonstrate the potential of patterned illumination for high-resolution imaging.

    Purpose of the Study:

    • To investigate the feasibility of achieving high-resolution infrared absorption mapping using patterned illumination.
    • To explore optical patterning strategies for overcoming diffraction limits in IR chemical imaging.

    Main Methods:

    • Simulations were performed using a confocal microscope setup.
    • A differential absorption scheme involving a saturated vortex-shaped beam and a Gaussian reference beam was modeled.
    • Experimentally relevant parameters were used to assess spatial resolution and energy requirements.

    Main Results:

    • Simulations indicate the generation of high-resolution vibrational absorption images.
    • A spatial resolution better than a tenth of the wavelength was predicted.
    • The method requires incident energies approximately a decade above the saturation threshold.

    Conclusions:

    • The proposed saturated structured illumination concept is compatible with scanning confocal microscopy for high-resolution IR absorption measurements.
    • This approach offers a pathway to significantly enhance the spatial resolution of IR chemical imaging.
    • Differential transmission/reflection measurements can yield detailed absorbance data at the nanoscale.