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Related Concept Videos

Atomic Absorption Spectroscopy: Instrumentation01:22

Atomic Absorption Spectroscopy: Instrumentation

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An atomic absorption spectrophotometer (AAS) comprises several components: a radiation source, an atomizer, a monochromator, and a detector. The radiation source can be a hollow-cathode lamp (HCL) or an electrodeless-discharge lamp (EDL), both of which provide a narrow emission line of the required wavelength. However, some instruments use continuum sources and high-resolution monochromators to achieve a narrow range of radiation.
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Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation01:26

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Inductively coupled plasma (ICP) is the common plasma source used in atomic emission spectroscopy (AES), a technique that detects and analyzes various elements in a sample. This method is often called inductively coupled plasma atomic emission spectroscopy (ICP-AES).
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Tandem Mass Spectrometry01:21

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Tandem mass spectrometry is a technique that uses multiple mass analyzers in series to obtain a higher selectivity and signal-to-noise ratio for the analyte. Instruments with multiple analyzers separated by an interaction cell enable secondary fragmentation and selected study of the fragment ions.
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Raman Spectroscopy Instrumentation: Overview01:26

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A conventional Raman spectrophotometer includes a laser source, a sample holding system, a wavelength selector, and a detector.
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IR Spectrometers01:25

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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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The instrumentation of atomic emission spectrometry (AES) involves various components, including atomization devices that convert samples into gas-phase atoms and ions. There are two main types of atomization devices: continuous and discrete atomizers.  Continuous atomizers, like plasmas and flames, introduce samples in a constant stream, while discrete atomizers inject individual samples using syringes or autosamplers. The most common discrete atomizer is the electrothermal atomizer.
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Versatile OSCAT time-domain THz spectrometer.

Lisa M Molteni, Jacopo Manzolli, Federico Pirzio

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    A new compact terahertz time-domain spectrometer (THz-TDS) utilizes an ultrafast Yb:CALGO laser and optical sampling by cavity tuning (OSCAT) for versatile spectral region operation. This validated instrument offers enhanced capabilities for material and gas analysis.

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    Area of Science:

    • Physics
    • Spectroscopy
    • Optics

    Background:

    • Terahertz (THz) time-domain spectroscopy (TDS) is a powerful technique for material characterization.
    • Compact and versatile THz-TDS systems are needed for broader applications.
    • Ultrafast laser technology enables advanced spectroscopic methods.

    Purpose of the Study:

    • To report on a novel, compact, and versatile THz time-domain spectrometer.
    • To demonstrate its operation using an ultrafast Yb:CALGO laser and photo-conductive antennas.
    • To validate its capabilities through characterization and spectroscopic measurements.

    Main Methods:

    • Development of a THz time-domain spectrometer operating from 0.2 to 2.5 THz.
    • Utilized optical sampling by cavity tuning (OSCAT) method based on laser repetition rate tuning.
    • Implemented a delay-time modulation scheme for enhanced performance.

    Main Results:

    • The instrument's characterization is presented and compared to classical THz-TDS.
    • Successful THz spectroscopic measurements were performed on a GaAs wafer substrate.
    • Water vapor absorption measurements further validated the instrument's capabilities.

    Conclusions:

    • The developed spectrometer is compact, versatile, and operates effectively in the THz spectral region.
    • The OSCAT method with delay-time modulation provides a robust platform for THz-TDS.
    • The instrument demonstrates significant potential for material science and gas analysis.