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紫外可见吸收光谱图上吸收峰蓝移和红移的原因是什么？导致了什么？ - 知乎 都卜勒效应 Red shift or bathochromic shift (红移)： π→ π* transitions 当有机化合物的结构发生变化，使其吸收带的最大吸收峰波长向长波方向移动，此现象称为「红移」。 红移现象往往是分子发生共轭作用、引入助色基团或带色团，或由于溶剂的影响而发生。例如：溶剂的极性、酸碱性，空间结构的变化
谁能用大白话解释一下 谱隙问题 怎么就哥德尔不完备了？ - 知乎 We show that the spectral gap problem is undecidable Specifically, we construct families of translationally-invariant, nearest-neighbour Hamiltonians on a 2D square lattice of d-level quantum systems (d constant), for which determining whether the system is gapped or gapless is an undecidable problem