Ultrafast Time-Resolved Soft X-Ray Photoelectron Spectroscopy of Dissociating <span class="aps-inline-formula"><math xmlns="http://www.w3.org/1998/Math/MathML" display="inline"><mrow><msub><mrow><mi>Br</mi></mrow><mrow><mn>2</mn></mrow></msub></mrow></math></span>

Lora Nugent-Glandorf; Michael Scheer; David A. Samuels; Anneliese M. Mulhisen; Edward R. Grant; Xueming Yang; Veronica M. Bierbaum; Stephen R. Leone

doi:10.1103/PhysRevLett.87.193002

Ultrafast Time-Resolved Soft X-Ray Photoelectron Spectroscopy of Dissociating ${Br}_{2}$

Lora Nugent-Glandorf, Michael Scheer, David A. Samuels, Anneliese M. Mulhisen, Edward R. Grant, Xueming Yang, Veronica M. Bierbaum, and Stephen R. Leone

Phys. Rev. Lett. 87, 193002 – Published 22 October 2001

Abstract

The dissociation of excited state ${Br}_{2}$ is probed with the novel technique of ultrafast soft x-ray photoelectron spectroscopy. Excited ${Br}_{2}$ molecules are prepared in the dissociative ${}^{1}Π_{u}$ state with 80 fs, 400 nm pulses, and a series of photoelectron spectra are obtained during dissociation with pulses of soft x-ray light (47 nm, 26.4 eV, 250 fs). The formation of Br atoms is readily detected and the data support an extremely fast dissociation time for ${Br}_{2}$ on the order of 40 fs. Amplitudes of the pump-probe features reveal that the ionization cross section of atomic Br at 47 nm is $\sim 40$ times larger than that of ${Br}_{2}$ .

Received 21 May 2001

DOI:https://doi.org/10.1103/PhysRevLett.87.193002

Authors & Affiliations

Lora Nugent-Glandorf, Michael Scheer^*, David A. Samuels, Anneliese M. Mulhisen, Edward R. Grant^†, Xueming Yang^‡, Veronica M. Bierbaum, and Stephen R. Leone^§

JILA, National Institute of Standards and Technology and Department of Chemistry and Biochemistry, Department of Physics, University of Colorado, Boulder, Colorado 80309-0440

^*Present address: Nortel Networks, MS 04332F15, Nepean, Ontario, Canada, K2H 8E9.
^†JILA Visiting Fellow. Permanent address: Department of Chemistry, Purdue University, West Lafayette, IN 47907.
^‡JILA Visiting Fellow. Permanent address: Institute of Atomic and Molecular Sciences, Academia Sinica, Taipei, Taiwan.
^§Also Quantum Physics Division, National Institute of Standards and Technology.