Schematic geometry of the laser induced fluorescence detection setup as incorporated in the crossed beams machine.
Pulse sequence for the crossed beams experiments and LIF detection. Delay times D1, D2, and D3 differ for distinct boron monoxide or cyano beams produced in the primary chamber. These delays are summarized in Tables I and II for boron monoxide and cyano, respectively.
LIF excitation spectra of A 2Πi–X 2Σ+ system in (0, 0) and (1, 1) vibrational bands of boron monoxide. Experimental spectra (upper curves) and best-fit simulations (lower curves) are shown for different boron oxide sources. The double headed appearance of the spectrum is caused by spin-orbit splitting of the upper state. Rotational assignment is shown for 11BO (0, 0) band. Intensity scale is kept the same to represent relative intensities of different sources.
Time-of-flight spectra for the crossed beams reactions of boron monoxide (11BO; X 2Σ+) with acetylene (C2H2; X 1Σg +) at a collision energy of 13.0 ± 0.8 kJ mol−1 (left) and with ethylene (C2H4; X 1Ag) at a collision energy of 12.4 ± 0.6 kJ mol−1(right). Heavy products of the atomic hydrogen loss channels at m/z = 52 and 54 are selected. 2.6 × 105 TOF spectra are averaged.
LIF excitation spectra of B 2Σ+–X 2Σ+ system in (0, 0), (1, 1), and (2, 2) vibrational bands of cyano radicals. Experimental spectra (red curves) and best-fit simulations (black curves) are shown for the specified peak velocities of cyano radical beam. Intensity scale is kept the same to represent relative intensities of the beams with different velocities.
Experimental conditions, characterization by QMS-TOF (peak velocity and integrated intensity of BO and BO2) and by LIF (rotational-vibrational state distribution) for the different sources of boron monoxide.
Experimental conditions (electronic delays), characterization by QMS-TOF (peak velocity) and by LIF (rotational-vibrational state distribution) for the different velocities of cyano radical beam.
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