STU-GTIIT光学论坛（No.44）
报告地点：at lecture hall E509 in the North Campus of GTIIT
报告时间：2025年4月22日 17:00
报告题目:The simplest molecules: H2+ and H3+ (a review)(全英)
报告人：Prof. Iain McNab(Chemistry Department, GTIIT)
报告摘要:
The two simplest molecules, H2+ and H3+ are difficult to study by experiment, but are testbeds for new methods of quantum mechanical solutions. Since the first observations of H2+ and H3+ ions as "rays of positive electricity", experiment has challenged theory, and now theory is beginning to return the challenge to experimentalists.
In the case of H2+, recent theoretical developments have led to unprecedented accuracy of quantum calculations such that recent spectra of H2+ and its isotopomers may lead to a redefinition of the electron/proton mass ratio and the electron/deuteron mass ratio.
In the case of H3+, a 27,000-line infrared predissociation spectrum, involving energy levels close or above the dissociation limit, showed characteristics of chaotic trajectories and scarring of the chaotic background due to periodic orbits. The theoretical approaches developed to understand the predissociation spectrum of H3+ have led to unprecedented understanding of high energy spectra, such as that of water molecules in the photosphere of the sun. Meanwhile, the low energy infrared spectra of H3+ have become useful probes of planetary atmospheres.
报告人简介：
Iain Ross McNab is a recovering spectroscopist with interests in calculational chemistry and pedagogy. His research has centered on laser spectroscopy of small diatomic ions (particularly H2+, H3+ and HCl++), and also charge transfer processes of molecules at surfaces, studied by Scanning Tunneling Microscopy. In pedagogy, Iain recently co-authored the fourth edition of the classic text "Pedrottis' Introduction to Optics" (Cambridge University Press, 2024, ISBN: 9781316518625).
Iain is currently a Visiting Professor at the Chemistry Department, GTIIT, and when in Canada, he occasionally teaches for "Canadian Laser Safety", while running the McNab Group (academic consultancy).
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理学院
2025年4月15日
