jp9b09219_si_001.pdf (1.07 MB)
Scattering Elimination of Heterodyne-Detected Two-Dimensional Infrared Spectra Using Choppers and Shutters
Version 2 2019-12-09, 18:48
Version 1 2019-12-08, 20:14
journal contribution
posted on 2019-12-09, 18:48 authored by Jin Gyu Seol, Hyejin Kwon, Geun Young Jin, Juran Moon, Chairyoung Yi, Yung Sam KimObtaining high-quality 2D IR spectra of heterogeneous
samples such
as perovskite films or metal–organic framework powder is hampered
by severe light scattering. In the pump–probe (PP) method,
this problem can be circumvented by phase cycling. However, in the
heterodyned photon echo (HPE) method, phase cycling does not function
as effectively as the PP method. This study demonstrates that the
scattering problem can be solved mechanically by introducing another
chopper and two shutters into the existing 2D IR setup without moving
any translation stages to introduce a phase shift in the HPE method.
For a perovskite film having a very rough surface, containing a small
amount of residual dimethylformamide, and having a maximum absorbance
of ∼0.0004 in the CO stretch region, this advanced
experimental method is tested and proven to be highly effective.