Chapter 5: Modulation Excitation Spectroscopy with Phase-Sensitive Detection for Surface Analysis

Ryan Richards, Sarah Shulda

Research output: Chapter in Book/Report/Conference proceedingChapterpeer-review

4 Scopus Citations

Abstract

Advancements in in situ spectroscopic techniques have led to significant progress being made in elucidating heterogeneous reaction mechanisms. The potential of these progressive methods is often limited only by the complexity of the system and noise in the data. Short-lived intermediates can be challenging, if not impossible, to identify with conventional spectra analysis means. Often equally difficult is separating signals that arise from active and inactive species. Modulation excitation spectroscopy combined with phase-sensitive detection analysis is a powerful tool for removing noise from the data while simultaneously revealing the underlying kinetics of the reaction. A stimulus is applied at a constant frequency to the reaction system, for example, a reactant cycled with an inert phase. Through mathematical manipulation of the data, any signal contributing to the overall spectra but not oscillating with the same frequency as the stimulus will be dampened or removed. With phase-sensitive detection, signals oscillating with the stimulus frequency but with various lag times are amplified providing valuable kinetic information. In this chapter, some examples are provided from the literature that have successfully used modulation excitation spectroscopy with phase-sensitive detection to uncover previously unobserved reaction intermediates and kinetics. Examples from a broad range of spectroscopic methods are included to provide perspective to the reader.

Original languageAmerican English
Title of host publicationNew Materials for Catalytic Applications
EditorsV. I. Parvulescu, E. Kemnitz
PublisherElsevier Inc.
Pages121-132
Number of pages12
ISBN (Print)9780444635877
DOIs
StatePublished - 2016

Bibliographical note

Publisher Copyright:
© 2016 Elsevier B.V. All rights reserved.

NREL Publication Number

  • NREL/CH-5100-66607

Keywords

  • Heterogeneous catalysts
  • In situ spectroscopic techniques
  • Modulation excitation spectroscopy combined with phase-sensitive detection analysis

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