## 1 Introduction  
Molecular dynamics, including nuclear motion and electronic motion, are one of the fundamental aspects in scientific investigations, the information of which provides microscopic insights into chemical reactions and biological processes. Photo-induced dynamics in molecules can be essential to natural processes as well as in applications: electron transportation fuels the photo-chemical energy transformation in photosynthesis [1], photoabsorption, and the subsequent molecular fragmentation leads to application in bioimaging [2] and radiation therapy [3]. Knowledge concerning the dynamics of the charge and the nuclei in a molecule, underlying phenomena--such as photoionization, charge migration, and molecular dissociation--underpins the potential for photo-control of these processes and therefore, the possibility for photo-steering chemical reactions at an atomic level, as well as for optimization of photo-production. Due to the ultrafast nature of molecular dynamics, e.g., tens to a few hundred femtoseconds for nuclear motion and sub-femtosecond to a few femtoseconds for electronic motion, ultrafast optical tools are needed for the investigation of these dynamics. Tabletop optical lasers in near infrared, VUV, and XUV regimes have been widely applied in work regarding the evolution of nuclear wavepackets and electronic wavepackets, typically with a pump-probe scheme [4, 5]. However, pump-probe experiments in the X-ray regime with tabletop lasers are still a challenge, due to the low photon output in the X-ray photon range, e.g., from high harmonic generation [6]. With the recent developments in free electron lasers (FELs), short wavelength pump-probe experiments have become practical, due to the high flux of FELs and have been realized with various X-ray split and delay (XRSD) designs [7; 8]. For accelerator-based X-ray sources, pulse splitting and delay can also be implemented in the electron accelerator stage, before creating the X-ray pulses [9]. X-ray photons can access specific atomic sites in a molecule by selective inner-shell ionization. This atomic-site specificity allows for creating localized charge and hence, tracing charge transfer even with a single pulse or with a pulse duration that is longer than the actual time scale of the dynamical process [10; 11]. In a previous work [10], charger transfer from iodine to the methyl group in methyl iodine molecule (CH\({}_{3}\)I) was investigated using near-infrared (NIR) and FEL pulses. Therein, the INR pulse produced singly charged molecular ions and initiated the dissociation and the FEL pulse created positive charge localized at the iodine which transferred to the methyl group at a later time. In this work, the vanished atomic iodine ion population at short pump-probe delay time indicates the charge transfer from the iodine to the methyl group. Single FEL pulse was also used to investigate molecular dynamics in CH\({}_{3}\)I and methylselenol (CH\({}_{3}\)SeH) [11; 12], where ion coincidence mapping was used for correlation of carbon and iodine charge states indicating the charge redistribution within the molecule. In single pulse experiments, the extraction of the timing information delay on theoretical models, typically involving Coulomb explosion [11; 13]. In the present work, we used a two-mirror XRSD apparatus to generate two X-ray pulses for the pump-probe experiment where we investigated the molecular dynamics in CH\({}_{3}\)I molecule. Using a single-color X-ray pump and X-ray probe scheme, we were able to probe with an independent clock X-ray induced molecular dynamics, e.g., the sequential ionization and relaxation of highly excited molecular ionic states via fragmentation. Using time-of-flight mass spectroscopy, we obtained the time profile of high charge states of atomic iodine and the evolution map of the kinetic energy (KE) distribution for selected charge states.