Точные измерения концентрации закиси азота, мощного парникового газа, в атмосфере Земли важны для моделирования радиационного баланса нашей планеты. Представлены измеренные коэффициенты уширения и сдвига линий N2O давлением воздуха при комнатной температуре для 82 колебательно-вращательных переходов в полосе (0002) ← (0000), вращательное квантовое число mменяется от 3 до 54. Измерения проведены на Фурье-спектрометре IFS-125M со спектральным разрешением 0,0056 см-1. Вычисленные коэффициенты уширения и сдвига линий получены полуклассическим методом, модифицированным включением в расчетную схему корректирующего фактора. Определенные нами параметры сравнивались с представленными в литературе и в современных базах спектроскопических данных. Выявлена колебательная зависимость полуширин линий для валентного колебания n3. Accurate measurements of the concentration of nitrous oxide, a potent greenhouse gas, in the Earth's atmosphere are important for modeling the radiation balance of our planet. The work presents the measured broadening and shift coefficients of N2O lines by air pressure at room temperature for 82 rovibrational transitions in the (0002) ← (0000) band; the rotational quantum number mvaries from 3 to 54. The measurements were carried out on an IFS-125M Fourier transform spectrometer with a spectral resolution of 0.0056 cm-1. The calculated line-broadening and shift coefficients were obtained using a semi-classical method modified by introducing a correction factor in the calculation scheme. Our parameters are compared with those presented in the literature and in modern spectroscopic databases. A vibrational dependence of the line half-widths for the n3stretching vibration was revealed.

The method of medium frequencies has been applied to calculate the collisional half-widths of vibrational-rotational lines of a water molecule under helium pressure. The calculations have been performed for a wide range of rotational quantum numbers (J from 0 to 20: the calculations have been made by the method of medium frequencies, and J from 20 to 50: the interpolation of dependence on J has been performed). The spectral range has been from 500 to 10 000 cm–1. The H2O–He line broadening coefficients obtained by us have been compared with the literature data and a good agreement has been obtained. The coefficients of the temperature dependence of the lines half-widths have been calculated.

Relative coefficients of collisional broadening caused by N 2 O molecules and their temperature dependences are determined for absorption lines (10 0 0–00 0 1 transition, R-branch) of the CO 2 molecule.

Relative coefficients of collisional broadening caused by N2O molecules and their temperature dependences are determined for absorption lines (1000–0001 transition, R-branch) of the CO2 molecule.

Relative coefficients of collisional broadening caused by NO molecules and their temperature dependences are determined for absorption lines (100–001 transition, R-branch) of the CO molecule.