Chirp dependence of wave packet motion in oxazine 1.
Chirp dependence of wave packet motion in oxazine 1.
复制标题
恶嗪 1 中波包运动的线性调频依赖性。
DOI：
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发表时间：
2005
影响因子：
2.9
通讯作者：
M. Braun
中科院分区：
文献类型：
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作者：
S. Malkmus;R. Dürr;C. Sobotta;H. Pulvermacher;W. Zinth;M. Braun
用光谱分辨瞬态吸收光谱研究了恶嗪1在甲醇中的振动波包运动。从600到700 nm的探测脉冲的光谱特性被选择为覆盖其中检测到基态漂白和受激发射信号的重叠区域。泵浦脉冲的光谱相位由基于液晶显示器的脉冲整形装置操纵。负啁啾和正啁啾的啁啾激发脉冲可分别用于激发主要处于基态或激发态的振动模式。为了区分观察到的波包在恶嗪1移动在基态或激发态，光谱分辨瞬态吸收实验进行各种值的线性啁啾的泵浦脉冲。波包运动的幅度显示出非对称行为，对于-0.75 +/-0.2 fs/nm的负啁啾具有最佳信号，这表明观察到主要的基态波包。
The motion of vibrational wave packets in the system oxazine 1 in methanol is investigated by spectrally resolved transient absorption spectroscopy. The spectral properties of the probe pulse from 600 to 700 nm were chosen to cover the overlap region where ground-state bleach and stimulated emission signals are detected. The spectral phase of the pump pulse was manipulated by a liquid crystal display based pulse-shaping setup. Chirped excitation pulses of negative and positive chirp can be used to excite vibrational modes predominantly in the ground or excited state, respectively. To distinguish the observed wave packets in oxazine 1 moving in the ground or excited state, spectrally resolved transient absorption experiments are performed for various values of the linear chirp of the pump pulses. The amplitudes of the wave packet motion show an asymmetric behavior with an optimum signal for a negative chirp of -0.75 +/- 0.2 fs/nm, which indicates that predominantly ground-state wave packets are observed.