来自液体微射流表面的和频与二次谐波产生。

Sum frequency and second harmonic generation from the surface of a liquid microjet.

作者信息

Smolentsev Nikolay, Chen Yixing, Jena Kailash C, Brown Matthew A, Roke Sylvie

机构信息

Laboratory for Fundamental Biophotonics (LBP), Institute of Bioengineering (IBI), School of Engineering (STI), École Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland.

Laboratory for Surface Science and Technology, Department of Materials, ETH Zürich, CH-8093 Zurich, Switzerland.

出版信息

J Chem Phys. 2014 Nov 14;141(18):18C524. doi: 10.1063/1.4896996.

DOI:10.1063/1.4896996

PMID:25399189

Abstract

The use of a liquid microjet as a possible source of interest for Second Harmonic Generation (SHG) and Sum Frequency Generation (SFG) spectroscopy is examined. We measured non-resonant SHG scattering patterns from the air/water interface of a microjet of pure water and observe a strong enhancement of the SHG signal for certain scattering angles. These enhancements can be explained by the optical properties and the shape of the liquid microjet. SFG experiments at the surface of a liquid microjet of ethanol in air show that it is also possible to measure the coherent vibrational SFG spectrum of the ethanol/air interface in this way. Our findings are useful for future far-UV or X-ray based nonlinear optical surface experiments on liquid jets. In addition, combined X-ray photoelectron spectroscopy and SHG/SFG measurements are feasible, which will be very useful in improving our understanding of the molecular foundations of electrostatic and chemical surface properties and phenomena.

摘要

研究了使用液体微射流作为二次谐波产生（SHG）和和频产生（SFG）光谱潜在感兴趣源的情况。我们测量了纯水微射流空气/水界面的非共振SHG散射图案，并观察到在某些散射角处SHG信号有强烈增强。这些增强可以通过液体微射流的光学性质和形状来解释。在空气中乙醇液体微射流表面进行的SFG实验表明，以这种方式测量乙醇/空气界面的相干振动SFG光谱也是可行的。我们的发现对于未来基于远紫外或X射线的液体射流非线性光学表面实验很有用。此外，结合X射线光电子能谱和SHG/SFG测量是可行的，这对于增进我们对静电和化学表面性质及现象的分子基础的理解将非常有用。