Compact broadband vibrational sum-frequency generation spectrometer with nonresonant suppression

Alexei Lagutchev, Aaron Lozano, Prabuddha Mukherjee, Selezion A. Hambir, Dana D. Dlott

Research output: Contribution to journalArticlepeer-review


A compact broadband vibrational sum-frequency spectroscopy (SFG) apparatus is described to study molecules at surfaces and interfaces. Using an étalon as the frequency narrowing device, the visible pulse has a time-asymmetric profile that allows the user to deeply suppress nonresonant background signals that hinder detection of molecular vibrational resonances. Several features of the spectrometer that, in aggregate, improve signal-to-noise ratios by a large factor are described. The spectrometer features a series of interchangeable prealigned sample holders for different applications. Examples of applications are presented where nonresonant suppression greatly improves the ability to study adsorbates on single-crystal surfaces as a function of rotation about the azimuth, and where the rapid data acquisition abilities of the spectrometer are used to study electrochemical transformations on single-crystal electrodes.

Original languageEnglish (US)
Pages (from-to)1289-1296
Number of pages8
JournalSpectrochimica Acta - Part A: Molecular and Biomolecular Spectroscopy
Issue number4
StatePublished - Apr 2010


  • Sum-frequency generation
  • Surface spectroscopy

ASJC Scopus subject areas

  • Instrumentation
  • Atomic and Molecular Physics, and Optics
  • Analytical Chemistry
  • Spectroscopy


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