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Molecular Frame Photoemission: Probe of the Photoionization Dynamics for Molecules in the Gas Phase
D. Dowek *,Y. J. Picard,P. Billaud,C. Elkharrat,J. C. Houver
Author NameAffiliationE-mail
D. Dowek * UniversitéParis-Sud 11, UMR 8625, Laboratoire des Collisions Atomiques et Moléculaires, Bat. 351; Université Paris-Sud, 91405 Orsay, France;CNRS, UMR 8625, Laboratoire des Collisions Atomiques et Moléculaires, Bat. 351, Université Paris-Sud,91405 Orsay, F danielle.dowek@u-psud.fr 
Y. J. Picard UniversitéParis-Sud 11, UMR 8625, Laboratoire des Collisions Atomiques et Moléculaires, Bat. 351; Université Paris-Sud, 91405 Orsay, France;CNRS, UMR 8625, Laboratoire des Collisions Atomiques et Moléculaires, Bat. 351, Université Paris-Sud,91405 Orsay, F  
P. Billaud UniversitéParis-Sud 11, UMR 8625, Laboratoire des Collisions Atomiques et Moléculaires, Bat. 351; Université Paris-Sud, 91405 Orsay, France;CNRS, UMR 8625, Laboratoire des Collisions Atomiques et Moléculaires, Bat. 351, Université Paris-Sud,91405 Orsay, F  
C. Elkharrat UniversitéParis-Sud 11, UMR 8625, Laboratoire des Collisions Atomiques et Moléculaires, Bat. 351; Université Paris-Sud, 91405 Orsay, France;CNRS, UMR 8625, Laboratoire des Collisions Atomiques et Moléculaires, Bat. 351, Université Paris-Sud,91405 Orsay, F  
J. C. Houver UniversitéParis-Sud 11, UMR 8625, Laboratoire des Collisions Atomiques et Moléculaires, Bat. 351; Université Paris-Sud, 91405 Orsay, France;CNRS, UMR 8625, Laboratoire des Collisions Atomiques et Moléculaires, Bat. 351, Université Paris-Sud,91405 Orsay, F  
Abstract:
Molecular frame photoemission is a very sensitive probe of the photoionization (PI) dynamics of molecules. This paper reports a comparative study of non-resonant and resonant photoionization of D2 induced by VUV circularly polarized synchrotron radiation at SOLEIL at the level of the molecular frame photoelectron angular distributions (MFPADs). We use the vector correlation method which combines imaging and time-of-flight resolved electron-ion coincidence techniques, and a generalized formalism for the expression of the I(χ,θe, φe) MFPADs, whereχis the orientation of the molecular axis with respect to the light quantization axis and (θe,φe) the electron emission direction in the molecular frame. Selected MFPADs for a molecule aligned parallel or perpendicular to linearly polarized light, or perpendicular to the propagation axis of circularly polarized light, are presented for dissociative photoionization (DPI) of D2 at two photon excitation energies, hⅴ=19 eV, where direct PI is the only channel opened, and hⅴ=32.5 eV, i.e. in the region involving resonant excitation of Q1 and Q2 doubly excited state series. We discuss in particular the properties of the circular dichroism characterizing photoemission in the molecular frame for direct and resonant PI. In the latter case, a remarkable behavior is observed which may be attributed to the interference occurring between undistinguishable autoionization decay channels.
Key words:  Dissociative photoionization, Molecular frame photoemission, Circular dichroism in photoemission, Autoionization dynamics, Synchrotron radiation, Vector correlation
FundProject:
Molecular Frame Photoemission: Probe of the Photoionization Dynamics for Molecules in the Gas Phase
D. Dowek *,Y. J. Picard,P. Billaud,C. Elkharrat,J. C. Houver
摘要:
在分子坐标系中光电子角度分布(MFPADs)的层次上,对D2分子用SOLEIL的真空紫外同步辐射圆偏振光诱发的共振和非共振光电离进行了比较研究. 采用结合了成像与飞行时间分辨的电子离子符合技术的矢量相关方法,以及用于表示MFPADs的强度I(χ,θe, φe)的通用形式. 其中χ是分子轴与光量子化方向之间的夹角,(θe,φe)是分子坐标系中电子的发射方向. 研究了D2分子在双光子激发能量下的解离光电离(DPI),在hⅴ=19 eV下直接光电离是唯一通道的情况,以及在hⅴ=32.5 eV对应于Q1和Q2双激
关键词:  解离光电离,分子结构光电效应,光电发射中的圆二色谱,自电离动力学,同步辐射矢量相关
DOI:10.1088/1674-0068/22/02/178-186
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