Jim got me some money yet again to come to the Austin conference in Easter 1984.

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Presentation transcript:

Jim got me some money yet again to come to the Austin conference in Easter 1984

Bob Curl had invited me to Rice after the conference

Resonant 2-photon ionisation (R2PI) spectroscopy of SiC 2 Si C

Rick Smalley

Rick Smalley at Rice University in Texas had developed a laser vapourisation technique to make metal clusters Aluminium

Hintenberger et al

● ● ● ● ● ● ● I suggested that if we replace the metal by graphite …as the carbon atoms react I expected them to form linear carbon chains ● ● ● ● ● ● ●

.. so simulate the conditions which produced our cyanopolyynes in the Red Giant IRC H−C≡C−C≡C−C≡NH−C≡C−C≡C−C≡N H−C≡C−C≡NH−C≡C−C≡N H−C≡C−C≡C−C≡C−C≡NH−C≡C−C≡C−C≡C−C≡N

Jim Heath and Sean O’Brien

Yuan Liu - Solved some software problems

. C≡C−C≡C−C≡C−C≡C−C≡C−C≡C−C≡C. + 2H → Laser vapourisation of graphite in hydrogen-helium mixture H−C≡C−C≡C−C≡C−C≡C−C≡C−C≡C−C≡C−H

Yuan had solved a software problem so we could at last print out some spectra C 11 C 15 C 19 C 23 C 60 C 70

I wrote this on my print out

New improved nozzle configuration – Sean O’Brien

Sean O’Brien found that the C 60 signal could be 30x that of C 58

Finally ca 40x that of C 58 JimHeath

Harry Kroto 2004 H−C≡C−C≡C−C≡NH−C≡C−C≡C−C≡N H−C≡C−C≡NH−C≡C−C≡N H−C≡C−C≡C−C≡C−C≡NH−C≡C−C≡C−C≡C−C≡N

Mass spectrum of carbon in which a species with 60 C atoms was first recognised as special

Plasma produced by laser vapourisation of graphite

..and so simulate the conditions which produced the carbon chain molecules in the carbon rich Red Giant Star IRC 10216

Magnetic Pulsed Valve

Hole for the laser pulse

Nozzle Plasma Skimmer hole Mass Spectrometer

The very sharp edged skimmer skims the expanding pulse into a very narrow beam Supersonic Expansion into the vacuum chamber cools the clusters to very low temperatures

Skimmer action more slowly

Rick Smalley at Rice University in Texas had developed a laser vapourisation technique to make metal clusters Aluminium

● ● ● ● ● ● ● If we replace the metal by graphite The carbon atoms should react to form carbon chains ● ● ● ● ● ● ●