Over the last decade two-dimensional infrared (2D IR) spectroscopy has proven to be a very useful extension of infrared spectroscopy, yet the technique remains restricted to a small group of specialized researchers because of its experimental complexity and high equipment cost. We report on a spectrometer that is compact, mechanically robust, and is much less expensive than previous designs because it uses a single pixel MCT detector rather than an array detector. Moreover, each axis of the spectrum can be collected in either the time or frequency domain via computer programming. We discuss pulse sequences for scanning the probe axis, which were not previously possible. We present spectra on metal carbonyl compounds at 5 |im and a model peptide at 6 |im. Data collection with a single pixel MCT takes longer than using an array detector, but publishable quality data are still achieved with only a few minutes of averaging.
Bibliographical noteFunding Information:
We thank Peter Hamm for useful discussions throughout this work. We also thank the Crim Research Group for loaning us their pulse shaping equipment. This research was funded by the Draper TIF Award from the Wisconsin Alumni Research Foundation for equipment purchases, NSF NSEC (DMR-0832760) and NIH (DK79895) supported the experimental design contributions by CTM, NSF (CHE-1012380) supported the experimental design and manuscript preparation by MTZ, NSF MRSEC (DMR-1121288) supported the data collection by SSM, the NIH Molecular Biophysics Training Grant (T32-GM08293) supported all aspects of the research by DRS, and the NSF Graduate Research Fellowship Program (DGE-0718123) supported the simulations by JEL.
- Multidimensional spectroscopy
- Pulse shaping Rapid scanning
- Two-dimensional infrared (2D IR) spectroscopy
- Ultrafast spectroscopy