The discovery of an orange flame is reported that appears also at
higher pressures of active nitrogen and
oxygen without the presence of a metal catalyst unlike previous
research in over 30 years. Enhancement of
emissions of the first positive band system of nitrogen was observed
from various vibrational levels of the
N2(B 3Πg) state.
Arguments to identify the species responsible and implications to
previous research of this
phenomenon of homogeneous excitation and collisional intersystem
crossing into N2(B 3Πg)
induced by excited
O2 are presented. Its probing for lasing is
suggested.
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