期刊
JOURNAL OF PHYSICAL CHEMISTRY A
卷 122, 期 3, 页码 780-787出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.jpca.7b10259
关键词
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资金
- BBSRC [Alert 13 BB/L014335/1]
- STFC Central Laser Facility
- BBSRC [BB/L014335/1] Funding Source: UKRI
- Biotechnology and Biological Sciences Research Council [BB/L014335/1] Funding Source: researchfish
A high-speed, high-sensitivity and compact two-dimensional infrared (2D-IR) spectrometer based on 100 kHz Yb:KGW regenerative amplifier technology is described and demonstrated. The setup is three color, using an independent pump OPA and two separately tunable probe OPAs. The spectrometer uses 100 kHz acousto-optic pulse shaping on the pump beam for rapid 2D-IR acquisitions. The shot-to-shot stability of the laser system yields excellent signal-to-noise figures (similar to 10 mu OD noise on 5000 laser shots). We show that the reduced bandwidth of the Yb:KGW amplifiers in comparison with conventional Ti:sapphire systems does not compromise the ability of the setup to generate high-quality 2D-IR data. Instrument responses of <300 fs are demonstrated and 2D-IR data presented for several systems of interest to physical chemists, showing spectral diffusion in NaSCN, amide I and II bands of a beta sheet protein and DNA base-pair backbone couplings. Overall, the increased data acquisition speed, intrinsic stability, and robustness of the Yb:KGW lasers are a significant step forward for 2D-IR spectroscopy.
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