ВИЗНАЧЕННЯ СПЕКТРАЛЬНОЇ ЗАЛЕЖНОСТІ ВЕЛИЧИНИ ВИПРОМІНЮВАЛЬНОЇ ЗДАТНОСТІ ФАКЕЛА ТВЕРДОЇ СУМІШНОЇ СИСТЕМИ

Multichannel optical pyrometer is described. Temperature measurement and emissivity definition methods are presented. Role of dispersed condensed phase of exterior torch layers is discussed. Описан многоканальний оптический пирометр, который изготовлен авторами, и методики определения с его помощью температуры и излучательной способности пламени на разных длинах волн. Показана роль концентрации дисперсной фазы внешних слоев факела при определении температуры и излучательной способности факела.Описано багатоканальний оптичний пірометр, який виготовлено авторами, і методики визначення з його допомогою температури та випромінювальної здатності на різних довжинах хвиль полум’я. Звертається увага на роль концентрації дисперсної фази зовнішніх шарів факела при визначенні температури і випромінювальної здатності полум’я

A flexible beamline combining XUV attosecond pulses with few-femtosecond UV and near-infrared pulses for time-resolved experiments

We describe a beamline where few-femtosecond ultraviolet (UV) pulses are generated and synchronized to few-cycle near-infrared (NIR) and extreme ultraviolet (XUV) attosecond pulses. The UV light is obtained via third-harmonic generation in argon or neon gas when focusing a phase-stabilized NIR driving field inside a glass cell that was designed to support high pressures for enhanced conversion efficiency. A recirculation system allows reducing the large gas consumption required for the nonlinear process. Isolated attosecond pulses are generated using the polarization gating technique and the photon spectrometer employed to characterize the XUV radiation consists of a new design based on the combination of a spherical varied-line-space grating and a cylindrical mirror. This design allows for compactness while providing a long entrance arm for integrating different experimental chambers. The entire interferometer is built under vacuum to prevent both absorption of the XUV light and dispersion of the UV pulses and it is actively stabilized to ensure an attosecond delay stability during experiments. This table-top source has been realized with the aim of investigating UV-induced electron dynamics in neutral states of bio-relevant molecules, but it also offers the possibility to implement a manifold of novel time-resolved experiments based on photo-ionization/excitation of gaseous and liquid targets by ultraviolet radiation. UV pump – XUV probe measurements in ethyl-iodide showcase the capabilities of the attosecond beamline