Related Experiment Video
Updated: Jun 17, 2026

Direct Comparison of Hyperspectral Stimulated Raman Scattering and Coherent Anti-Stokes Raman Scattering Microscopy for Chemical Imaging
Published on: April 28, 2022
A dual recording, variable range, rapid-scan spectrometer; comparison of simultaneously recorded stark-broadened
1Sandia Laboratory, Albuquerque, New Mexico 87115, USA.
Abstract:
An ultrarapid scanning spectrometer has been constructed that records spectra at a constant angle of diffraction. The spectral scanning is accomplished by the rotation of a high-speed rotating mirror (7.6 cm diam) that causes a collimated light beam to sweep across a plane grating, changing the angle of incidence. The full-aperture scanning range depends upon the over-all grating width, upon the grating spacing, and upon the orientation of the grating with respect to the high-speed mirror. For example, a 12.5-cm, 1200-lines/mm grating gives a scanning range of approximately 2000 A on each of two separate detector systems, or a total range of 4000 A that can be centered at any wavelength between 4000 A and 8000 A. This grating provides a theoretical resolving power of approximately 85,000 in the first order, a reciprocal dispersion of 17.5 A/mm at f/5, and a spectral scan speed of 115 A/microsec at 1100 rps. This spectrometer has been used to record, simultaneously, Stark-broadened Halpha and Hbeta emission line profiles from a transient plasma generated in the impulse tube. Electron densities calculated from the half-width of the Hbeta profiles are in good agreement with values obtained by fitting the line wings of the self-absorbed Halpha profiles to the theoretical profiles of Griem, Kolb, and Shen.
Related Concept Videos
Inductively Coupled Plasma Atomic Emission Spectroscopy: Instrumentation
There are three main types of inductively coupled plasma atomic emission spectroscopy (ICP-AES) instruments: sequential, simultaneous multichannel, and Fourier transform instruments, with the latter being less commonly used.
¹³C NMR: ¹H–¹³C Decoupling
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
¹H NMR: Complex Splitting
Splitting diagrams or splitting tree diagrams are routinely used to depict such complex couplings. While drawing splitting diagrams, the splitting with the larger coupling constant is usually applied first.
2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)
High-Resolution Mass Spectrometry (HRMS)
Atomic Emission Spectroscopy: Instrumentation
