In situ Second‐Harmonic Generation Circular Dichroism with Submonolayer Sensitivity

In this work, we present an experimental setup for the in situ and ex situ study of the optical activity of samples, which can be prepared under ultra‐high vacuum (UHV) conditions by second‐harmonic generation circular dichroism (SHG‐CD) over a broad spectral range. The use of a racemic mixture as a...

Full description

Saved in:
Bibliographic Details
Published in:Chemphyschem 2019-01, Vol.20 (1), p.134-141
Main Authors: von Weber, Alexander, Jakob, Matthias, Kratzer, Eva, Kartouzian, Aras, Heiz, Ueli
Format: Article
Language:English
Subjects:
Anisotropy
circular dichroism
Dichroism
Enantiomers
Harmonic generations
High vacuum
laser spectroscopy
Multilayers
Naphthol
Optical activity
polarized spectroscopy
second-harmonic generation
submonolayer sensitivity
Substrates
Thin films
Citations: Items that this one cites
Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:In this work, we present an experimental setup for the in situ and ex situ study of the optical activity of samples, which can be prepared under ultra‐high vacuum (UHV) conditions by second‐harmonic generation circular dichroism (SHG‐CD) over a broad spectral range. The use of a racemic mixture as a qualified reference for the anisotropy factor is described and, as an example, the chiroptical properties of 1.5 μm thick (multilayers) as well as sub‐monolayer thin films of the R‐ and S‐enantiomer of 1,1′‐Bi‐2‐naphthol (BINOL) evaporated onto BK7 substrates were investigated. Measure the thinnest: Second‐harmonic generation circular dichroism (SHG‐CD) is a versatile tool to investigate chirality at interfaces and surfaces. Here we demonstrate its strength by measuring in situ the optical activity of molecular films prepared under ultra‐high vacuum (UHV) conditions with submonolayer sensitivity. This illustrates how SHG‐CD can be combinable with UHV prepared model systems to bring further insight into the chiroptical response of asymmetric heterogeneous catalysts, for example.
ISSN:1439-4235
1439-7641
DOI:10.1002/cphc.201800897