Sezer Uĝur, Schmid Philipp, Felix Lukas, Mayor Marcel, Arndt Markus
University of Vienna, Faculty of Physics, VCQ and QuNaBioS, Boltzmanngasse 5, 1090, Vienna, Austria.
J Mass Spectrom. 2015 Jan;50(1):235-9. doi: 10.1002/jms.3526.
Molecular beam techniques are a key to many experiments in physical chemistry and quantum optics. In particular, advanced matter-wave experiments with high-mass molecules profit from the availability of slow, neutral and mass-selected molecular beams that are sufficiently stable to remain intact during laser heating and photoionization mass spectrometry. We present experiments on the photostability with molecular libraries of tailored oligoporphyrins with masses up to 25,000 Da. We compare two fluoroalkylsulfanyl-functionalized libraries based on two different molecular cores that offer the same number of anchor points for functionalization but differ in their geometry and electronic properties. A pentaporphyrin core stabilizes a library of chemically well-defined molecules with more than 1600 atoms. They can be neutrally desorbed with velocities as low as 20 m/s and efficiently analyzed in photoionization mass spectrometry.
分子束技术是物理化学和量子光学中许多实验的关键。特别是，使用高质量分子进行的先进物质波实验受益于慢速、中性且经过质量选择的分子束，这些分子束足够稳定，在激光加热和光电离质谱分析过程中能保持完整。我们展示了关于质量高达25,000 Da的定制寡聚卟啉分子库光稳定性的实验。我们比较了基于两种不同分子核心的两个氟代烷基硫醇官能化分子库，这两种核心提供相同数量的官能化锚点，但几何形状和电子性质不同。一个五卟啉核心稳定了一个由超过1600个原子组成的化学结构明确的分子库。它们可以以低至20 m/s的速度中性解吸，并在光电离质谱分析中进行有效分析。
