The integrated absorption bands for the C-H stretching overtones (Deltav=5) of C2H4, C2H6, C3H8, C4H10, HC(CH3)(3), and C(CH3)(4) have been measured at 295 K between 13000 and 14300 cm(-1), using the phase shift cavity ring down (PS-CRD) technique. Similar absorption bands have been obtained using a White cell with an optical path length of 6.0 m and a Fourier transform spectrophotometer operating in the visible (FT-VIS) region. The integrated intensity and the linearity of the absorption with the density of the gas are independent of the form of modulation of the laser (square or sine wave) using the PS-CRD technique. The oscillator strengths calculated with the two techniques are in excellent agreement. (C) 2004 Elsevier B.V. All rights reserved.