美国Ultrafast Helios IR飞秒中红外瞬态吸收光谱仪
发布：2016-09-28 23:50 | 来源：未知 | 浏览：
Helios-IR设计与飞秒中红外光源 (例如：配备DFG模式的TOPAS) 一起工作，探测2 - 10 μm的瞬态中红外吸收光谱，包括：激发态吸收 (Excited State Absorption)，受激辐射 (Stimulated Emission)，振动弛豫(Vibrational relexation) ，振动和转动能级（Rotational levels, Vibrational levels）和荧光辐射 (Fluorescent Emission)等。
籍此分析基态吸收引发的能量转移、电荷迁移、振动或转动能级跃迁、以及多激子效应 (Multiple Exciton Generation, MEG) 和俄歇复合(Auger recombination)等超快过程。
应用领域包括：
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1 单碳纳米管自由载流子迁移率
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2 窄带隙量子点( PbS)的电子转移
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3 染料敏化光伏材料、有机光伏材料电子迁移
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4 非线性光吸收材料的激发态吸收等。
技术参数：
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1 Low profile direct-drive ultra-high speed optical delay line integrated in the spectrometer housing.
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Time window: 8 ns
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Resolution: 14 fs
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Minimum step size: 2.8 fs
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Max. speed: >10 ns/s
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Acceleration: > 260 ns/s^2
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2 Temporal Resolution. The instrument response function is a cross-correlation of the pump and probe pulses. The typical HELIOS IR IRF is 1.4 times longer than the laser’s fundamental pulse duration. See the optical delay line description for more details.
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3 Probe spectral range.
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4 Spectral Resolution. Helios-IR spectrometer comes standard with three gratings to allow for different detection bandwidths and spectral resolution. The system comes standard with the following gratings:
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3-9 µm, 0.4 µm bandwidth with 6.2 nm resolution
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4-10 µm, 0.8 µm bandwidth 12.4 nm resolution
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3-9 µm, 1.2 µm bandwidth 18.6 nm resolution
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5 Detectors. Helios-IR can be configured with a several MCT array detector options, with larger arrays for broader detection bandwidth or higher spectral resolution and dual array detectors for reference detection.
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32, 64 and 128 element single array
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16×2, 32×2 and 64×2 element dual array (recommended)
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6 Dimensions
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Optical bench: W34” x L56” x H14” (W864 x L1425 x H356mm)
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Electronics rack: W21” x L24” x H27” (W534 x L610 x H686 mm)
