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<!--StartFragment--><p class="MsoNormal" style="text-align: justify; "><font size="4">Rydberg-Rydberg transitions
of BaF molecules have been directly observed in our lab. The key to the
experimental success is our ability to combine two powerful and new
technologies, chirped-pulse millimeter-wave spectroscopy (CPmmW) and a buffer
gas cooled molecular beam source. CPmmW spectroscopy is a form of broadband
(20GHz bandwidth), high-resolution (50 kHz), free induction decay-detected
(FID) spectroscopy with accurate relative intensities (10%), which had been previously
applied to record Rydberg-Rydberg spectra of Ca atoms. To extend CPmmW
spectroscopy to a molecular system, we have constructed a new setup, a 20 K
Neon buffer gas cooled molecular beam system, which generates of beam
containing >100 times more molecules and 10 times less translational
velocity than a Smalley-type laser ablation supersonic beam source. Hundreds of
molecular Rydberg-Rydberg transitions with high resolution and high dynamic
range can now be recorded in a few hours. The success of this experiment
suggests many applications in the near future, such as developing a user-friendly
experimental method to study and manipulate Rydberg molecules, preparing a
single molecular beam pulse that contains 10<sup>8</sup> state-selected
core-nonpenetrating Rydberg molecules/molecular ions, and studying the
electronic structure (dipole and quadrupole moments and polarizability) of the
molecular ion core with unprecedented precision and completeness. In addition,
strong collective effects (superradiance) have also been observed.<o:p></o:p></font></p><p class="MsoNormal"><font size="4"> </font></p><p class="MsoNormal" align="center"><font size="4">Grier Room, MIT Bldg 34-401<o:p></o:p></font></p><p class="MsoNormal" align="center"><font size="4">Refreshments served after
the lecture</font><font size="6"><o:p></o:p></font></p>
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