情境教学成就物理课堂

在物理课堂教学中,实施合理性情境教学,将激发学生投身于物理活动之中.什么是情境教学呢?情境教学是指教师在教学过程中,有目的地创设或引入与教学内容相呼应的具体场景或教学资源,提高学习效率的一种教学方法,情境教学以培养兴趣为前提,以情感共鸣作基础,有利于激发学生学习的主动性,减轻学习负担;增强学生学习的感受性,让学生体验学习的愉悦,享受学习的快乐,激发学习的兴趣,开启物理之门.     

BS2和BS2-分子的红外光谱和Jahn-Teller效应

Laser ablated boron atoms have been reacted with hydrogen sulfide and the reaction products condensed with argon at 4 K, which gave BS₂, BS₂^-, HSBS, and HBS molecules. Reagent isotopic substitution (H₂S, H₂³⁴S, D₂S, ¹⁰B, ¹¹B) and variation of boron and hydrogen sulfide concentrations have been used to identify the major products. Both BS₂^- and BS₂ were identified as linear molecules with no significant difference in the structure parameters, but the B-S anti-symmetric stretching vibration of BS₂ is significantly lower than that of BS₂^-, which is ascribed to pseudo Jahn-Teller effect. Theoretical calculation was employed to have an insight into the interaction nature of the bonds in the corresponding products.