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High-Resolution Mass Spectrometry (HRMS)

High-Resolution Mass Spectrometry (HRMS)

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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Related Experiment Video

Updated: Mar 9, 2026

High-Resolution Neutron Spectroscopy to Study Picosecond-Nanosecond Dynamics of Proteins and Hydration Water

High-Resolution Neutron Spectroscopy to Study Picosecond-Nanosecond Dynamics of Proteins and Hydration Water

Published on: April 28, 2022

Ultra-High Resolution Inelastic Neutron Scattering.

D A Neumann¹, B Hammouda¹

¹National Institute of Standards and Technology, Gaithersburg, MD 20899.

Journal of Research of the National Institute of Standards and Technology

|January 6, 2017

Summary

This summary is machine-generated.

Discover advanced neutron scattering techniques, including backscattering and spin echo spectrometers. Learn about their research applications and upcoming cold neutron spectrometer at the NIST Cold Neutron Research Facility (CNRF).

Keywords:

diffusion inelastic neutron scattering molecular reorientations neutron backscattering spectrometers neutron spin-echo spectrometers polymer dynamics rotational tunneling

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$Studying Soft-matter and Biological Systems over a Wide Length-scale from Nanometer and Micrometer Sizes at the Small-angle Neutron Diffractometer KWS-2$

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Area of Science:

Materials Science
Condensed Matter Physics
Neutron Scattering Physics

Background:

Ultra-high energy resolution neutron scattering instruments are crucial for advanced materials research.
Backscattering spectrometers and spin echo spectrometers offer unique capabilities for probing material dynamics.

Purpose of the Study:

To describe two types of ultra-high energy resolution neutron scattering instruments: backscattering and spin echo spectrometers.
To provide examples of research applications for these advanced neutron scattering techniques.
To discuss plans for a new cold neutron backscattering spectrometer at the NIST Cold Neutron Research Facility (CNRF).

Main Methods:

Description of the principles and functionalities of backscattering spectrometers.
Explanation of the principles and functionalities of spin echo spectrometers.
Overview of the planned cold neutron backscattering spectrometer at CNRF.

Main Results:

Detailed descriptions of backscattering and spin echo spectrometers are provided.
Illustrative examples showcase the diverse research potential of these instruments.
Plans for the new cold neutron spectrometer at NIST CNRF are outlined.

Conclusions:

Backscattering and spin echo spectrometers are powerful tools for materials research.
The planned cold neutron spectrometer at NIST CNRF will enhance research capabilities.
This information serves as a guide for researchers planning neutron scattering experiments at NIST.