High resolution spectral measurements in the nu(5) band of formaldehyde using a tunable IR diode laser.
Line strengths and broadening coefficients for formaldehyde (H(2)CO) near 3.5 microm were measured at room temperature using a tunable IR diode laser. Because of the extremely narrow linewidth of the laser ( approximately 10(-3) cm(-1)), the transitions were recorded at a resolution limited only by collision and Doppler broadening. The spectral parameters were determined from Voigt line shape fits to R and Q branch rotational-vibrational transitions of the nu(5) band between 2867 and 2881 cm(-1). Line strength measurements were made on both pure and dilute samples of H(2)CO. Pressure broadening of H(2)CO lines by N(2) was measured in mixtures containing 0.8-1.2% H(2)CO.
Cline
D S
DS
Varghese
P L
PL