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首页> 外文期刊>Journal of Physical Organic Chemistry >Study of absorption spectrum and dynamics evaluation of the indocyanine-green first singlet excited state
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Study of absorption spectrum and dynamics evaluation of the indocyanine-green first singlet excited state

机译：吲哚菁绿第一单重态激发态的吸收光谱和动力学评价

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摘要

Excited state absorption and excited state dynamics of indocyanine-green (ICG) dissolved in dymethyl sulfoxide were measured using white-light continuum Z-scan (WLCZScan) and white-light continuum pump-probe (WLCPP) techniques. The excited state absorption spectrum, obtained through Z-scan measurements, revealed saturable absorption (SA) for wavelengths longer than 630 nm, while reverse saturable absorption (RSA) appeared, as indicated by a band at approximately 570 nm. Both processes were modeled by a three-energy-level diagram, from which the excited state cross-section values were determined. SA and RSA were also observed in pump-probe experiments, with a recovery time in the hundreds of picoseconds time scale due to the long lifetime of the first excited state of ICG. Such results contribute to the understanding of ICG optical properties, allowing application in photonics and medicine.
机译：使用白光连续谱Z扫描（WLCZScan）和白光连续谱泵浦探针（WLCPP）技术测量了溶解在二甲基亚砜中的吲哚菁绿（ICG）的激发态吸收和激发态动力学。通过Z扫描测量获得的激发态吸收光谱显示，对于波长大于630 nm的波长，可饱和吸收（SA），而出现反向饱和吸收（RSA），如大约570 nm的谱带所示。这两个过程均通过三能级图建模，由此确定了激发态截面值。在泵浦探针实验中还观察到了SA和RSA，由于ICG的第一个激发态的寿命较长，因此恢复时间为数百皮秒。这样的结果有助于理解ICG的光学特性，从而允许在光子学和医学中应用。

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