Structural characterization of gas-phase [M,C,2H]⁺ (M = Ta, Ir, Pt), formed by reacting laser ablation formed M⁺ with ethylene oxide (c-C₂H₄O) or methane under multiple collision conditions, is achieved using infrared multiple-photon dissociation (IR-MPD) spectroscopy with the intracavity free-electron laser FELICE. After product formation, part of the product distribution is complexed with Ar, allowing for simultaneous recording of IR-MPD spectra of both bare [M,C,2H]⁺, which dissociates via dehydrogenation, and [M,C,2H]⁺∙Ar, which loses Ar. Comparison of the spectra with density functional theory (DFT) calculations allows for an internally consistent assignment of the spectra to the Ta⁺CH₂ (³A′′) distorted carbene, Pt⁺CH₂ (²A₁) carbene, and to the HIr⁺CH (¹A′) carbyne-hydride. Evidence for a symmetric Ta⁺CH₂∙Ar (³B₂) complex is also obtained. For Pt and Ir, these structures match those found in previous work when these species were formed by reaction of M⁺ with methane, CH₄ and CD₄. Under the current conditions, no clear signs of the previously observed Ir⁺CH₂ (³A₂) carbene product were found, consistent with its higher energy, especially after Ar complexation. Potential energy surfaces for the reactions of Pt⁺ and Ir⁺ with c-C₂H₄O are also computed.

气相[M，C，2H] ⁺（M = Ta，Ir，Pt）的结构表征是通过在多个碰撞条件下使形成的M ^+的激光烧蚀与环氧乙烷（cC ₂ H ₄ O）或甲烷反应而形成的使用腔内自由电子激光FELICE进行红外多光子离解（IR-MPD）光谱分析可实现。后的产物形成，产品分发的一部分络合用Ar，允许两个裸[M，C，2H]的IR-MPD光谱的同时记录⁺，经由脱氢解离，和[M，C，2H] ⁺∙Ar，失去Ar。光谱与密度泛函理论（DFT）计算的比较允许将光谱内部一致地分配给Ta ⁺ CH ₂（³ A''）扭曲的卡宾，Pt ⁺ CH ₂（² A ₁）卡宾以及HIr ⁺ CH（¹ A'）乙炔氢化物。还获得了对称的Ta ⁺ CH ₂ ∙Ar（³ B ₂）配合物的证据。对于Pt和Ir，这些结构与以前的工作中发现的结构相符，当时这些物种是通过M ⁺与甲烷，CH _4的反应形成的。和CD ₄。在当前条件下，未发现先前观察到的Ir ⁺ CH ₂（³ A ₂）卡宾产物的明显迹象，与其较高的能量相符，尤其是在Ar络合后。还计算了Pt ⁺和Ir ⁺与cC ₂ H ₄ O反应的势能面。