What goes into an academic poster? - Stanford University · From an experimental point of view, the high photon flux and the high repetition rate provided by the European XFEL will

What goes into an academic poster?

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The Molecular Wire Charge migration down an HNCnO chain

P. Badanko, A. Battistoni, A. G. Ciriolo, E. Champenois, A. Csehi, D. Faccialà , N. Golubev, I. Khalil, M. Silva, M. R. Ware, T. Wolf

Motivation We propose to use two color intense x-ray pulses of sub-10-fs duration to drive and reveal charge migration processes in molecules. Probing the transfer of electronic charge within a molecule is of fundamental importance in the life sciences and has been the central subject of a large number of theoretical and experimental investigations in physics and chemistry [1-2], one of the main goals of these studies being the control of molecular dynamics and chemical reactions.

NEXAFS Spectrum

References [1] O. Bixner et al., J. Chem. Phys. 136, 204503 (2012) [2] B. Giese, M. Graber, and M. Cordes, Curr. Opin. Chem. Biol. 12, 755 (2008) [3] N. Golubev and A. I. Kuleff, Phys Rev A 91, 051401 (2015) [4] J. D. Biggs, Y. Zhang, D. Healion, and S. Mukamel, J. Chem. Phys. 136, 174117 (2012)

[5] I. V. Schweigert and S. Mukamel, Phys. Rev. Lett. 99, 163001 (2007) [6] Li. et al. Phys. Rev. A 89, 031404 (2014) [7] C. Weninger et al., Phys. Rev. Lett. 111, 233902 (2013)

METHODS A pair of pulses from the XFEL, with variable time delay, will be used to pump and probe the system [8]. The first pulse will be centered at 533eV, have 5eV of bandwidth, and be intense enough to efficiently drive Raman redistribution on the Oxygen site. We aim for an intensity of 1018W/cm2, achievable with a 3um focus assuming an incoming pulse of 118GW. The probe pulse will be at 520eV, above the Nitrogen edge, leading to ionization of core electrons predominately on the Nitrogen site but also from Carbon atoms. A parker valve synchronized with the 10 Hz FEL repetition rate will be used to deliver the sample. Isocyanic acid (HNCO) is gaseous at room temperature and has to be freshly synthesized and cooled. 5-Aminopentanal is liquid at ambient conditions (boiling point: 456 K) and has to be heated to get into the gas phase. The sample delivery is tested to give a sufficient sample density in the interaction region(10^9 to 10^12 1/cm^3) After ionization by the probe pulse, Auger decay from the ionized Nitrogen (Carbon) atom will yield an electron with a nominal kinetic energy of 380eV (280eV). The fine structure of this Auger electron energy will be sensitive to the presence of the initially excited wavepacket. The Auger lifetime of 2-3fs [13] and the pulse durations of 2 fs are short enough to resolve the dynamics. We will collect the Auger electrons and measure their kinetic energies using a Magnetic Bottle Spectrometer, allowing for 4π solid angle collection and good energy resolution [14]. At the same time, a Time of Flight spectrometer will collect ion fragments with mass sensitivity. We expect molecular dissociation to be sensitive to which atomic site was probed, leading to different ion fragments depending on the Carbon or Nitrogen atom ionized. Since we expect less than one event per shot, we can assign each Auger electron with an ion fragment and thus an atom of origin.

Key points

● The experiment we proposed aims at probing the temporal evolution of an electron wavepacket in molecules excited by means of Resonance Raman transitions through an intermediate autoionizing state [4-6].

● Excitation is achieved using a pulse at an energy capable of activating a Raman process from the core level of a specific atom in a chemically selective way. The excited state is associated with the production of an electron wavepacket whose dynamical evolution can be experimentally probed by monitoring, on a femtosecond timescale, the Auger process induced by a second X-ray pulse [7]. Since electronic wavepacket localization affects the Auger decay, the Auger spectrum can be used as a fingerprint for accessing the electronic dynamics. Initial optical manipulation of electronic population produced by Stimulated Raman process has already been shown in atoms [8]. Our proposal claims to extend this approach to molecular samples.

● From an experimental point of view, the high photon flux and the high repetition rate provided by the European XFEL will offer a unique tool for studying unfavorable processes in very diluted gas-phase molecular samples [9-11].

● The extremely short duration achievable with this source is of fundamental importance to temporally resolve ultrafast processes in the femtosecond time regime. ● Moreover, we would have a unique benefit from the state-of-the-art technology based on electron spectroscopy and coincidence techniques provided by the Small

Quantum System (SQS) scientific instrument. [12]

C N

Adapted from https://www.atom.uni-frankfurt.de

[8] A. Marinelli et al. Nat. Commun. 6, 6369, (2015) [9] S.W. Epp et al., Phys. Rev. Lett. 98, 183001 (2007) [10] H.B. Pedersen et al., Phys. Rev. Lett. 223202 (2007) [11] Kanter et al. Phys. Rev. Lett. 107, 233001 (2011) [12] T. Mazza et al., doi:10.3204/XFEL.EU/TR-2012-007 (2012) [13] A. M. Rijs et al., J. Electron. Spectrosc. Relat. Phenom. 112, 151-162 (200) [14] M. Guilhaus, J. Mass Spectrom. 30, 1519-1532 (1995)

5 shifts: Shift 1: Alignment of chamber, calibration of

detection, single color spectra

Shift 2: Pump-probe spectroscopy with HNCO

Shift 3: Pump-probe spectroscopy with 5-

Aminopentanal at oxygen edge / nitrogen edge

Shift 4-5: Pump-Probe spectroscopy with 5-

Aminopentanal at oxygen edge / carbon edge

Process takes approximately ~8 fs [3]

http://doi.org10.3204/XFEL.EU/TR-2012-007






Storytelling

Storytelling What are some attributes of a good story teller?

• …


• … • Engaging


• … • Engaging • Relatable


• … • Engaging • Relatable • Adapts to the audience

Storytelling What should a good story teller avoid?


• … • TLAs


• … • TLAs • Three letters acronyms


• … • TLAs • Three letters acronyms • Jargon


• … • TLAs • Three letters acronyms • Jargon • Monotone

Storytelling How do you translate your research into an interactive and compelling story?


1. Need a sales pitch.


1. Need a sales pitch. Does your work cure cancer?


1. Need a sales pitch. Does your work cure cancer? Resolve a problem underlying fundamental physics?


1. Need a sales pitch. Does your work cure cancer? Resolve a problem underlying fundamental physics? Is your summer project going to make a the lives of many a graduate student slightly easier?



(a) In one sentence, what is the big picture question that you have worked on this

summer?




summer?

Take one minute to write down a response, then two minutes to share it with a neighbor and get feedback.




summer? (b) Why should other scientists care about answering this question?




2. Identify the important details of your work in a manner your audience can understand.




(a) Boil your work down to a 3 part explanation / 3 step process / 3 step derivation.





(a) Boil your work down to a 3 part explanation / 3 step process / 3 step derivation. (b) Can you think of a simple analogy to describe your research?



1. Need a sales pitch. Does your work cure cancer? Resolve a problem underyling fundamental physics? Is your summer project going to make a the lives of many a graduate student slightly easier?


3. What’s next? Have a sexy cliff-hanger to your research to get the professors begging to hear more from you?




3. What’s next? Have a sexy cliff-hanger to your research to get the professors begging to hear more from you?

Do you have an interesting cliff-hanger you can end your presentation on?


Documents

What goes into an academic poster? - Stanford University · From an experimental point of view, the high photon flux and the high repetition rate provided by the European XFEL will