PRESSURE BROADENING AND SATURATION LINESHAPES OF CO AT PRESSURES BETWEEN $10^{-2}$ PA AND $10^{2}$ PA

Saturated absorption lineshapes in the CO v=1←0 band were measured at pressures between 10−2 Pa and 102 Pa in pure CO and CO-He mixtures with a spectral resolution of better than Δν/ν=3×10−10. The CO saturation signals mainly consist of narrow dips with a homogeneous width that nonlinearly depends on pressure due to dominant contributions of velocity changing collisions (VCC) and a broader background that can also be attributed to VCC. Preliminary evaluation shows a change of the CO self broadening coefficient from 96 kHz/Pa for p<3 Pa to 38 kHz/Pa for 15 Pa

Keywords:

• Homogeneous
• Nuclear magnetic resonance
• Saturation (chemistry)
• Infrared spectroscopy
• Spectral resolution
• Chemistry
• Analytical chemistry
• Absorption (pharmacology)
• Atomic physics
• Compounds of carbon

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