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首页> 外文期刊>Optics Letters >1-D imaging of rotation-vibration non-equilibrium from pure rotational ultrafast coherent anti-Stokes Raman scattering
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1-D imaging of rotation-vibration non-equilibrium from pure rotational ultrafast coherent anti-Stokes Raman scattering

机译:旋转振动非平衡的1-D成像来自纯旋转超速相干反斯托克斯拉曼散射

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摘要

We present one-dimensional (1-D) imaging of rotation-vibration non-equilibrium measured by two-beam pure rotational hybrid femtosecond/picosecond coherent anti-Stokes Raman scattering (fs/ps CARS). Simultaneous measurements of the spatial distribution of molecular rotation-vibration non-equilibrium are critical for understanding molecular energy transfer in low temperature plasmas and hypersonic flows. However, non-equilibrium CARS thermometry until now was limited to point measurements. The red shift of rotational energy levels by vibrational excitation was used to determine the rotational and vibrational temperatures from 1-D images of the pure rotational spectrum. Vibrational temperatures up to 5500 K were detected in a CH4/N-2 nanosecond-pulsed pin-topin plasma within 2 mm near the cathode. This approach enables study of non-equilibrium systems with 40 mu m spatial resolution. (C) 2020 Optical Society of America
机译:我们呈现一维(1-D)成像的旋转振动非平衡,通过双梁纯旋转混合杂交Femtosecond / PicoSecond连贯的防斯托克斯拉曼散射(FS / PS Cars)测量。 分子旋转振动非平衡的空间分布的同时测量对于理解低温等离子体和超声波流动的分子能量转移至关重要。 然而,非平衡汽车温度测量到现在仅限于点测量。 通过振动激励的旋转能量水平的红色移位来确定纯旋转光谱的1-D图像的旋转和振动温度。 在靠近阴极附近的2mm内的CH4 / N-2纳秒脉冲销栅等离子体中检测高达5500k的振动温度。 这种方法能够研究具有40μm空间分辨率的非平衡系统。 (c)2020美国光学学会

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