Energy partitioning in the femtosecond-laser-induced associative D2 desorption 
from Ru(0001)

Wagner, Steffen; Frischkorn, Christian; Wolf, Martin; Rutkowski, Marco; Zacharias, Helmut; Luntz, Alan C.

doi:10.1103/PhysRevB.72.205404

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Energy partitioning in the femtosecond-laser-induced associative D₂ desorption from Ru(0001)

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Citation

Wagner, S., Frischkorn, C., Wolf, M., Rutkowski, M., Zacharias, H., & Luntz, A. C. (2005). Energy partitioning in the femtosecond-laser-induced associative D₂ desorption from Ru(0001). Physical Review B, 72(20): 205404. doi:10.1103/PhysRevB.72.205404.

Cite as: https://hdl.handle.net/21.11116/0000-0011-1CC7-E

Abstract

Energy transfer to different degrees of freedom during the femtosecond-laser-induced recombinative desorption of D₂ from a deuterium-covered Ru(0001) surface (D_ads+D_ads/Ru→D_2,gas+Ru) has been investigated. (1+1')-resonance-enhanced multiphoton photoionization (REMPI) and time-of-flight (TOF) measurements are utilized to provide information on the internal and external (translational) energy content, respectively. Rovibrational population distributions of the reaction product are detected via various B₁Σ⁺_u←X¹Σ⁺_g Lyman bands using tunable vacuum ultraviolet laser radiation in the resonant excitation step. Rotational quantum state populations in the vibrational ground state and the first excited state are measured yielding average rotational energies of ⟨E_rot⟩/k_B=800 and 1500 K, respectively, for an absorbed laser fluence ⟨F⟩ of 85 J/m². In addition, a mean vibrational energy of the desorbing molecules is extracted which amounts to ⟨E_vib⟩/k_B=1200 K. Extensive TOF measurements enable complete energy balancing with ⟨E_trans⟩/2k_B=2500 K at ⟨F⟩=85 J/m² and underline the nonthermal and unequal energy partitioning between the different degrees of freedom within the reaction product. The effects of multidimensional electronic friction between substrate and adsorbate layer and peculiarities of the potential energy landscape governing the D₂ recombination are discussed.